Fatto generale: 19650 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 19650 is an unremarkable number.
Trivia: 19650 is an uninteresting number.
Data storica: October 18th is the day in 1356 that Basel earthquake, the most significant historic seismological event north of the Alps, destroys the town of Basel, Switzerland.