Q: What is the sum of all factors of the number 11,880 excluding 11,880?

A: 31,320

Why is 31,320 the sum of all factors of 11,880, excluding 11,880?

The factors of the number 11,880 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 18, 20, 22, 24, 27, 30, 33, 36, 40, 44, 45, 54, 55, 60, 66, 72, 88, 90, 99, 108, 110, 120, 132, 135, 165, 180, 198, 216, 220, 264, 270, 297, 330, 360, 396, 440, 495, 540, 594, 660, 792, 990, 1080, 1188, 1320, 1485, 1980, 2376, 2970, 3960, 5940, 11880.

If you add them up, you will get the total of 11,911. Now subtract 11,880 to get 31,320