Q: What is the sum of all factors of the number 1,668,440 excluding 1,668,440?

Why is 2,161,240 the sum of all factors of 1,668,440, excluding 1,668,440?

The factors of the number 1,668,440 are: 1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 787, 1060, 1574, 2120, 3148, 3935, 6296, 7870, 15740, 31480, 41711, 83422, 166844, 208555, 333688, 417110, 834220, 1668440.

If you add them up, you will get the total of 1,668,442. Now subtract 1,668,440 to get 2,161,240

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