1, 2, 4, 8, 16
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All numbers have factors. Some numbers have some of the same factors as other numbers. Multiples of numbers have all of the factors of numbers that are factors of them, plus some of their own. 32 is a multiple of 16 and will have all of its factors. 64 is a multiple of both 32 and 16 and will have all of their factors.
The factors of 16 are 1, 2, 4, 8 and 16.The prime factor of 16 is 2.None of them are negative.
Prime numbers to the fourth power, like 16 and 81.
16 has an odd number of factors; its factors are 1, 2, 4, 8, and 16
Common factors of both numbers are: 1, 2, 4 and 8