The proper factors of 18 are 2, 3, 6, and 9. All factors of 18 are 1, 2, 3, 6, 9, and 18. Prime factors of 18 are 2 x 3 x 3.
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The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36.
18 and all factors of 18. 18 and all factors of 18. 18 and all factors of 18. 18 and all factors of 18.
The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
Prime numbers don't have proper factors.
The proper factors of 16 are 1,2,4, and 8 :)