Mathematical fact: 1055 is the maximum value of n so that there exist 5 denominations of stamps so that every postage from 1 to n can be paid for with at most 10 stamps.
Trivia: 1055 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: November 20th is the day in 1739 that Start of the Battle of Porto Bello between British and Spanish forces during the War of Jenkins' Ear.