Q: What is the sum of all factors of the number 1,920 excluding 1,920?

 A: 4,200

Why is 4,200 the sum of all factors of 1,920, excluding 1,920?

The factors of the number 1,920 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 320, 384, 480, 640, 960, 1920.

If you add them up, you will get the total of 1,924. Now subtract 1,920 to get 4,200


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