Fatto generale: 20653 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20653 is a boring number.
Trivia: 20653 is an uninteresting number.
Data storica: July 17th is the day in 1976 that the opening of the Summer Olympics in Montreal is marred by 25 African teams boycotting the New Zealand team.