There is only one even Prime number: 2. So, representing 20 as a sum of even prime numbers would be 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2.
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148
It is 75.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
17
(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.