Mathematical fact: 9020 is the number of ways to color the vertices of a triangle with 30 colors, up to rotation.
Trivia: 9020 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: September 10th is the day in 2001 that Charles Ingram cheats his way into winning one million pounds on a British version of Who Wants to be a Millionaire.