Q: What is the sum of all factors of the number 1,283,720 excluding 1,283,720?

Why is 1,653,880 the sum of all factors of 1,283,720, excluding 1,283,720?

The factors of the number 1,283,720 are: 1, 2, 4, 5, 8, 10, 20, 40, 67, 134, 268, 335, 479, 536, 670, 958, 1340, 1916, 2395, 2680, 3832, 4790, 9580, 19160, 32093, 64186, 128372, 160465, 256744, 320930, 641860, 1283720.

If you add them up, you will get the total of 1,283,721. Now subtract 1,283,720 to get 1,653,880

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