2 x 5
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The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, 10.
1, 2, 3, 5, 6, 10 and 15. Some people do not consider 1 to be a proper factor.
The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
The proper factors of 16 are 1,2,4, and 8 :)
Prime numbers don't have proper factors.