Q: What is the sum of all factors of the number 30,780 excluding 30,780?

A: 70,860

Why is 70,860 the sum of all factors of 30,780, excluding 30,780?

The factors of the number 30,780 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 19, 20, 27, 30, 36, 38, 45, 54, 57, 60, 76, 81, 90, 95, 108, 114, 135, 162, 171, 180, 190, 228, 270, 285, 324, 342, 380, 405, 513, 540, 570, 684, 810, 855, 1026, 1140, 1539, 1620, 1710, 2052, 2565, 3078, 3420, 5130, 6156, 7695, 10260, 15390, 30780.

If you add them up, you will get the total of 30,850. Now subtract 30,780 to get 70,860