Q: What is the sum of all factors of the number 11,520 excluding 11,520?

A: 28,338

Why is 28,338 the sum of all factors of 11,520, excluding 11,520?

The factors of the number 11,520 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 45, 48, 60, 64, 72, 80, 90, 96, 120, 128, 144, 160, 180, 192, 240, 256, 288, 320, 360, 384, 480, 576, 640, 720, 768, 960, 1152, 1280, 1440, 1920, 2304, 2880, 3840, 5760, 11520.

If you add them up, you will get the total of 11,548. Now subtract 11,520 to get 28,338