The top spot on the ranking of the artists with the most No. 1 Hot 100 hits hasn't changed in 45 years, with the Beatles (20 leaders, tallied in 1964-70) fending off closest competitor Mariah Carey (18). Notably, Rihanna has entered a tie, with Michael Jackson, for the third-most Hot 100 No. 1s (13), all since her first, "SOS," in 2006.

See the All-Time Charts: Billboard 200 Albums | Billboard 200 Artists | Hot 100 Songs | Hot 100 Artists

20, The Beatles
18, Mariah Carey
13, Michael Jackson
13, Rihanna
12, Madonna
12, The Supremes
11, Whitney Houston
10, Janet Jackson
10, Stevie Wonder

The list of acts with the most Hot 100 No. 1s was compiled from the chart's Aug. 4, 1958 inception through the chart dated Oct. 10, 2015.