No. Even numbers are never prime numbers. A Prime number is a number that is only divisible by 1 and itself. Even numbers are always divisible by 2, so they are never prime.
And 20 is also divisible by 4 and 5. Its factors are 1, 2, 4, 5, 10, and 20.
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what number is not a prime factor
The prime number less than 10 that, when added to either 10 or 20, results in a prime number is 3. When you add 10 to 3, you get 13, which is a prime number. Similarly, when you add 20 to 3, you get 23, which is also a prime number.
23 is the smallest prime number greater than 20.
23 is the only prime number between 20 and 28.
23