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Prime number
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.
The sum of two prime numbers will be composite unless one of the prime numbers is 2.
Find the prime factorization. Identify the distinct prime factors. Add them up.
No. It is also divisible by 3, as you will see if you add the digits of the number together.