Do the math... think logically... that is impossible.
So Wilt fucked 10-20 women a day everyday of his life? - LOL!
Not impossible, but very unlikely.
Say he started at 20. 2 per day
on average. During one year is 730 dames 30 active years up until he was in his 50's, that is 21 900.
In real life, say he did 4 new girls a week and one or two orgies during every weekend, that would work - but yes highly unlikely.
1 per day on average sounds more plausible, that's 11 000 circa.
The story is according to wiki:
According to Rod Roddewig, a contemporary of Wilt's, the 20,000 number was created when he and Chamberlain were staying in Chamberlain's penthouse in Honolulu during the mid-eighties. He and Chamberlain stayed at the penthouse for 10 days, over the course of which he recorded everything on his Daytimer.[clarification needed] For every time Chamberlain went to bed with a different girl he put a check in his daytimer. After those 10 days there were 23 checks in the book, which would be rate of 2.3 women per day. He divided that number in half, to be conservative and to correct for degrees of variation. He then multiplied that number by the number of days he had been alive at the time minus 15 years. That was how the 20,000 number came into existence.[19]