Fait général: 7420 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 7420 is the number of permutations of 8 items that fix 2 elements.
Culture générale: 7420 is an unremarkable number.
Date historique: April 24th is the day in 1479 BC that Thutmose III ascends to the throne of Egypt, although power effectively shifts to Hatshepsut (according to the Low Chronology of the 18th Dynasty).