Prime-time viewership numbers compiled by Nielsen for Dec. 17-23. Listings include the week’s ranking and viewership.

1. ‘‘NCIS,’’ CBS, 19.59 million.

2. NFL Football: San Francisco at Seattle, NBC, 19.50 million.

3. ‘‘NCIS: Los Angeles,’’ CBS, 15.48 million.

4. ‘‘The Voice’’ (Tuesday), NBC, 14.13 million.

5. ‘‘Sunday Night NFL Pre-Kick,’’ NBC, 13.67 million.

6. ‘‘The Voice’’ (Monday), NBC, 13.37 million.

7. ‘‘The Big Bang Theory,’’ CBS, 10.95 million.

8. ‘‘The OT,’’ Fox, 10.94 million.

9. ‘‘Mike & Molly,’’ CBS, 10.79 million.

10. ‘‘Hawaii Five-0,’’ CBS, 10.54 million.

11. ‘‘Football Night in America,’’ NBC, 10.23 million.

12. ‘‘2 Broke Girls,’’ CBS, 10.22 million.

13. ‘‘Vegas,’’ CBS, 9.82 million.

14. ‘‘The X Factor’’ (Thursday), Fox, 9.66 million.

15. ‘‘Person of Interest,’’ CBS, 9.40 million.

16. ‘‘60 Minutes Presents,’’ CBS, 8.89 million.

17. ‘‘How I Met Your Mother,’’ CBS, 8.70 million.

18. ‘‘Two and a Half Men,’’ CBS, 8.67 million.

19. ‘‘The X Factor’’ (Wednesday), Fox, 8.35 million.

20. ‘‘A White House Christmas’’, NBC, 8.29 million.

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