Fatto generale: 23447 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 23447 is an unremarkable number.
Trivia: 23447 is a boring number.
Data storica: March 11th is the day in 1872 that the Meiji Japanese government officially annexes the Ryukyu Kingdom into what would become the Okinawa prefecture.