Q: What is the sum of all factors of the number 21,240 excluding 21,240?

A: 48,960

Why is 48,960 the sum of all factors of 21,240, excluding 21,240?

The factors of the number 21,240 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 59, 60, 72, 90, 118, 120, 177, 180, 236, 295, 354, 360, 472, 531, 590, 708, 885, 1062, 1180, 1416, 1770, 2124, 2360, 2655, 3540, 4248, 5310, 7080, 10620, 21240.

If you add them up, you will get the total of 21,288. Now subtract 21,240 to get 48,960