Hecho general: 20502 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 20502 is a boring number.
Trivia: 20502 is an unremarkable number.
Fecha histórica: February 17th is the day in 1871 that the victorious Prussian Army parades though Paris, France after the end of the Siege of Paris during the Franco-Prussian War.