Fatto generale: 2090 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2090 is the number of possible rows in a 17×17 crossword puzzle.
Trivia: 2090 is an unremarkable number.
Data storica: September 20th is the day in 1697 that the Treaty of Rijswijk is signed by France, England, Spain, the Holy Roman Empire and the Dutch Republic ending the Nine Years' War (1688–97).