General fact: 18905 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 18905 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 18905 is a boring number.
Historical date: October 4th is the day in 1967 that Omar Ali Saifuddin III of Brunei abdicates in favour of his son, His Majesty Sultan Hassanal Bolkiah.