Q: What is the sum of all factors of the number 388,640 excluding 388,640?

A: 663,712

Why is 663,712 the sum of all factors of 388,640, excluding 388,640?

The factors of the number 388,640 are: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 70, 80, 112, 140, 160, 224, 280, 347, 560, 694, 1120, 1388, 1735, 2429, 2776, 3470, 4858, 5552, 6940, 9716, 11104, 12145, 13880, 19432, 24290, 27760, 38864, 48580, 55520, 77728, 97160, 194320, 388640.

If you add them up, you will get the total of 389,303. Now subtract 388,640 to get 663,712