Fatto generale: 23603 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 23603 is a boring number.
Trivia: 23603 is an unremarkable number.
Data storica: August 14th is the day in 1900 that the Eight-Nation Alliance occupies Beijing, in a campaign to end the bloody Boxer Rebellion in China.