Q: What is the sum of all factors of the number 871,600 excluding 871,600?

Why is 1,223,380 the sum of all factors of 871,600, excluding 871,600?

The factors of the number 871,600 are: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 2179, 4358, 8716, 10895, 17432, 21790, 34864, 43580, 54475, 87160, 108950, 174320, 217900, 435800, 871600.

If you add them up, you will get the total of 871,601. Now subtract 871,600 to get 1,223,380

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