Fatto generale: 20835 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20835 is an uninteresting number.
Trivia: 20835 is an unremarkable number.
Data storica: January 15th is the day in 1991 that the United Nations deadline for the withdrawal of Iraqi forces from occupied Kuwait expires, preparing the way for the start of Operation Desert Storm.