Yes those numbers appear to be largely correct if you only consider accusations that have lead to a law suit or have been widely reported by news media.
Donald Trump: at least 15
Wikipedia has a list of the accusers of Donald Trump:
- Ivana Trump
- Jill Harth
- Jessica Leeds
- Kristin Anderson
- Cathy Heller
- Temple Taggart McDowell
- Karena Virginia
- Mindy McGillivray
- Rachel Crooks
- Natasha Stoynoff
- Jessica Drake
- Ninni Laaksonen
- Summer Zervos
- Burnett's unnamed friend
- Cassandra Searles.
In addition, there has been accusations that he has entered the dressing room of a number of pageants.
Bill O'Reilly: at least 6
The New York Times reports five settlements. Taking into account this article by the Chicago Tribune and this one by AXIOS, I compiled a list of accusers (in no particular order):
- Andrea Mackris
- Wendy Walsh
- Rebecca Gomez Diamond
- Juliet Huddy
- Laurie Dhue
- Andrea Tantaros
- Rachel Witlieb Bernstein (claimed verbal abuse, not clear to me if there were any lewd comments)
Roger Ailes: at least 9
Huffington Post gives the names of eight. Since then, Alisyn Camerota ha also alleged sexual harassment. It isn't clear where the 20+ figure is derived, but there are certainly many different accusers.
Barack Obama: ?