Q: What is the sum of all factors of the number 1,689,400 excluding 1,689,400?

Why is 2,238,920 the sum of all factors of 1,689,400, excluding 1,689,400?

The factors of the number 1,689,400 are: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 8447, 16894, 33788, 42235, 67576, 84470, 168940, 211175, 337880, 422350, 844700, 1689400.

If you add them up, you will get the total of 1,689,402. Now subtract 1,689,400 to get 2,238,920

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