Fatto generale: 20737 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20737 is an unremarkable number.
Trivia: 20737 is an uninteresting number.
Data storica: October 9th is the day in 1845 that the eminent and controversial Anglican, John Henry Newman, is received into the Roman Catholic Church.