Hecho matemático: 1020 is the number of ways to place 2 non-attacking kings on a 7×7 chessboard.
Trivia: 1020 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: October 16th is the day in 1949 that the diplomatic relations between the Soviet Union and the German Democratic Republic are established.