Fatto generale: 20837 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20837 is an unremarkable number.
Trivia: 20837 is an unremarkable number.
Data storica: January 17th is the day in 1997 that a Delta 2 carrying a GPS2R satellite explodes 13 seconds after launch, dropping 250 tons of burning rocket remains around the launch pad.