Fait général: 20513 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 20513 is a boring number.
Culture générale: 20513 is an unremarkable number.
Date historique: February 28th is the day in 1997 that the North Hollywood shootout takes place, resulting in the injury of 19 people and the deaths of both perpetrators.