What is the greatest common factor of 16, 27, and 20
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The prime factorization of 16 is $2^4$, the prime factorization of 27 is $3^3$, and the prime factorization of 20 is $2^2 \cdot 5$. The common factors are 2 and 1. The greatest of these is $\boxed{2}$.
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