Fatto generale: 2305 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 2305 is an unremarkable number.
Trivia: 2305 is a boring number.
Data storica: April 23rd is the day in 1951 that American journalist William N. Oatis is arrested for espionage by the Communist government of Czechoslovakia.