Fox’s reboot of “The X-Files,” which had produced strong same-day ratings when it launched last Sunday, is looking even more impressive in just-released delayed-viewing numbers. In fact, the number of viewers who watched the premiere exceeded the show’ peak season average.

In Nielsen’s “live plus-3” estimates, “The X-Files” averaged 20.3 million viewers — a 25% jump from its previously reported 16.2 million viewers in same-day. More than half of the 4.1 million-viewer lift in the three days following the premiere (2.1 million) came from video-on-demand, while the other 2 million came via DVR playback.

Sunday’s premiere also drew 1.1 million viewers in three days of streaming on Hulu and FoxNow, bringing the show’s multi-platform premiere audience to 21.4 million. (The only other Fox premiere to do better online this season was the “Empire” premiere, with 1.5 million).

By comparison, the peak season of “The X-Files” in 1997-98 averaged 19.8 million, and its series finale in 2002 drew 13.2 million. Its all-time high in viewership came on Jan. 26, 1997, when the episode titled “Leonard Betts” averaged 29.1 million viewers when it followed the network’s coverage of the Super Bowl game between New England and Green Bay.

In adults 18-49, the Sunday premiere of “The X-Files” grew 28% to a 7.8 rating, topping the show’s series finale by 24% (6.3). The 7.8 rating makes it television’s third-highest premiere this season in L+3 — behind only AMC’s “The Walking Dead” and Fox’s “Empire.”

The last scripted entertainment program to deliver a higher 18-49 rating for an NFL Conference Championship game was CBS’ “Numbers” in 2005 (9.2).

In other “live plus-3” numbers for Sunday programs, E! saw another strong showing by “Keeping Up With the Kardashians,” which averaged a 1.65 rating in adults 18-49 and 2.89 million viewers overall; it was the No. 1 cable show of the night in several categories and No. 2 in adults 18-49 (behind a 1.71 for Bravo’s “Real Housewives of Atlanta”).

And following it at 10 p.m., the series premiere of “Hollywood Medium with Tyler Henry” (0.75 in 18-49, 1.71 million viewers overall) stood as the network’s top non-spinoff reality premiere in three years (doesn’t include “I Am Cait”). Three airings of “Tyler Henry” drew 3.2 million unique viewers on Sunday night.

WEEK’S TOP SERIES IN ADULTS 18-49

(Live plus-3 for Jan. 18-24, 2016)

1. The X-Files (Fox), 7.8

2. NCIS (CBS), 3.1

3. Criminal Minds (CBS), 3.0

4. American Idol-Wednesday (Fox), 2.9

5. Scorpion (CBS), 2.8

5. American Idol-Thursday (Fox), 2.8

5. The Blacklist (NBC), 2.8

8. The Bachelor (ABC), 2.7

8. Chicago Fire (NBC), 2.7

10. Black-ish (ABC), 2.6

10. The Goldbergs (ABC), 2.6

10. Law & Order: SVU (NBC), 2.6

13. Life in Pieces (CBS), 2.5

13. The Big Bang Theory-r (CBS), 2.5

15. Supergirl (CBS), 2.4

16. Shades of Blue (NBC), 2.4

17. NCIS: New Orleans (CBS), 2.3

17. NCIS: Los Angeles (CBS), 2.3

17. The Middle (ABC), 2.3

17. Chicago PD (NBC), 2.3

21. Saturday Night Live (NBC), 2.2

21. Mom (CBS), 2.2

21. Blue Bloods (CBS), 2.2

21. Chicago Med (NBC), 2.2

21. 2 Broke Girls (CBS), 2.2

WEEK’S TOP SERIES IN TOTAL VIEWERS (in millions)

(Live plus-3 for Jan. 18-24, 2016)

1. NCIS (CBS), 20.48

2. The X-Files (Fox), 20.29

3. NCIS: New Orleans (CBS), 15.63

4. Blue Bloods (CBS), 15.23

5. Scorpion (CBS), 14.47

6. NCIS: Los Angeles (CBS), 13.75

7. Hawaii Five-0 (CBS), 12.59

8. Criminal Minds (CBS), 12.12

9. The Big Bang Theory-r (CBS), 11.85

10. The Blacklist (NBC), 11.51

11. Chicago Fire (NBC), 11.20

12. American Idol-Thursday (Fox), 10.81

13. Shades of Blue (NBC), 10.75

14. American Idol-Wednesday (Fox), 10.73

15. Supergirl (CBS), 10.29

16. Life in Pieces (CBS), 10.17

17. Mom (CBS), 10.15

18. Code Black (CBS), 10.04

19. 60 Minutes Presents-r (CBS), 9.92

20. Elementary (CBS), 9.50

21. Chicago PD (NBC), 9.36

22. Chicago Med (NBC), 9.34

23. Law & Order: SVU (NBC), 9.28

24. Limitless (CBS), 8.99

25. The Bachelor (ABC), 8.94

Source: Nielsen