Fatto generale: 17803 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 17803 is an unremarkable number.
Trivia: 17803 is a boring number.
Data storica: September 27th is the day in 1949 that the first Plenary Session of the National People's Congress approves the design of the Flag of the People's Republic of China.