Fatto matematico: 2090 is the number of possible rows in a 17×17 crossword puzzle.
Trivia: 2090 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: September 20th is the day in 1857 that the Indian Rebellion of 1857 ends with the recapture of Delhi by troops loyal to the East India Company.