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.
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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