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The prime factors are: 2 x 2 x 5
It's not, because all the factors of 20 aren't prime.
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 20 are: 1, 2, 4, 5, 10, and 20.The prime factors of 20 are: 2 and 5.
The factors of 4 are 1, 2, and 4. The only prime factor of 4 is 2. The factors of 20 are 1, 2, 4, 5, 10, and 20. The prime factors of 20 are 2x2x5.
There are no common factors between these values since 11 is prime and 20 is composite. Then, there are no common prime factors between these values.