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Anonymous
64
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32, 2
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16, 2 2
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8, 2 2 2
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4, 2 2 2 2
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2,2 2 2 2 2
your primes for 64 are 2,2,2,2,2,2. 2x2x2x2x2x2=64 or 26 is 64.
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20 as a product of primes = 2 * 2 * 5
2 x 2
2*2*2*2*5 = 80
2 x 3
46 = 2 x 23