Q: What is the sum of all factors of the number 12,180 excluding 12,180?

A: 28,140

Why is 28,140 the sum of all factors of 12,180, excluding 12,180?

The factors of the number 12,180 are: 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 29, 30, 35, 42, 58, 60, 70, 84, 87, 105, 116, 140, 145, 174, 203, 210, 290, 348, 406, 420, 435, 580, 609, 812, 870, 1015, 1218, 1740, 2030, 2436, 3045, 4060, 6090, 12180.

If you add them up, you will get the total of 12,208. Now subtract 12,180 to get 28,140