Fatto generale: 17949 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 17949 is an unremarkable number.
Trivia: 17949 is an uninteresting number.
Data storica: February 20th is the day in 1339 that the Milanese army and the St. George's (San Giorgio) Mercenaries of Lodrisio Visconti clashed in the Battle of Parabiago.