Q: What is the sum of all factors of the number 387,840 excluding 387,840?

A: 863,088

Why is 863,088 the sum of all factors of 387,840, excluding 387,840?

The factors of the number 387,840 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 101, 120, 128, 160, 192, 202, 240, 256, 303, 320, 384, 404, 480, 505, 606, 640, 768, 808, 960, 1010, 1212, 1280, 1515, 1616, 1920, 2020, 2424, 3030, 3232, 3840, 4040, 4848, 6060, 6464, 8080, 9696, 12120, 12928, 16160, 19392, 24240, 25856, 32320, 38784, 48480, 64640, 77568, 96960, 129280, 193920, 387840.

If you add them up, you will get the total of 388,703. Now subtract 387,840 to get 863,088