1 2 4 5 10 20.
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The factors of 20 are: 1, 2, 4, 5, 10, 20
The positive integer factors of 20 are: 1, 2, 4, 5, 10, and 20.
The prime factors of 20 are 2x2x5.
NO because 5 is a factor of 20 and its odd
Since 5 is a factor of 20, all the factors of 5 are common to 20.