Fatto generale: 20854 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20854 is an unremarkable number.
Trivia: 20854 is an uninteresting number.
Data storica: February 3rd is the day in 1637 that Tulip mania collapses in the United Provinces (now the Netherlands) as sellers could no longer find buyers for their bulb contracts.