Q: What is the sum of all factors of the number 907,720 excluding 907,720?

Why is 1,321,400 the sum of all factors of 907,720, excluding 907,720?

The factors of the number 907,720 are: 1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440, 2063, 4126, 8252, 10315, 16504, 20630, 22693, 41260, 45386, 82520, 90772, 113465, 181544, 226930, 453860, 907720.

If you add them up, you will get the total of 907,721. Now subtract 907,720 to get 1,321,400

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