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Q: Why are there only four factors for 20?

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The factors of 20 are 1,2,4,5,10 and 20. Two are odd, four are even.

1,2,4,5,10,20

1, 2, 4, 5, 10, 20 Pick four.

Four has only three factors: 1 2 4.

16 does not have four prime factors, only one.

There are an infinite number of numbers with only four factors, started by 6, 8 and 10.

Four common factors.

Four only has three factors.

8 only has four factors.

Because there are only six factors... 1,2,4,5,10 & 20

There is more than one possible answer. The prime factors of 16 are 2, 2, 2, and 2. It has four prime factors, but only one distinct prime factor. The prime factors of 24 are 2, 2, 2, and 3. It has four prime factors, but only two distinct prime factors. The prime factors of 36 are 2, 2, 3, and 3. It has four prime factors, but only two distinct prime factors. The prime factors of 40 are 2, 2, 2, and 5. It has four prime factors, but only two distinct prime factors. The prime factors of 54 are 2, 3, 3, and 3. It has four prime factors, but only two distinct prime factors. The prime factors of 56 are 2, 2, 2, and 7. It has four prime factors, but only two distinct prime factors. The prime factors of 60 are 2, 2, 3, and 5. It has four prime factors, but only three distinct prime factors. The prime factors of 81 are 3, 3, 3, and 3. It has four prime factors, but only one distinct prime factor. The prime factors of 84 are 2, 2, 3, and 7. It has four prime factors, but only three distinct prime factors. The prime factors of 88 are 2, 2, 2, and 11. It has four prime factors, but only two distinct prime factors. The prime factors of 90 are 2, 3, 3, and 5. It has four prime factors, but only three distinct prime factors.

85 has four factors.

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