Q: What is the sum of all factors of the number 639,680 including 639,680?
A: 1,524,000
The factors of the number 639,680 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 1999, 3998, 7996, 9995, 15992, 19990, 31984, 39980, 63968, 79960, 127936, 159920, 319840, 639680.
If you add them up, you will get the total of 1,524,000.