Hecho general: 19910 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 19910 is an unremarkable number.
Trivia: 19910 is a boring number.
Fecha histórica: July 5th is the day in 1833 that Admiral Charles Napier defeats the navy of the Portuguese usurper Dom Miguel at the third Battle of Cape St. Vincent.