Fait général: 20497 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 20497 is a boring number.
Culture générale: 20497 is a boring number.
Date historique: February 12th is the day in 1851 that Edward Hargraves announces that he has found gold in Bathurst, New South Wales, Australia, starting the Australian gold rush.