Explanation

The numbers between 20 and 30 are: 21, 22, 23, 24, 25, 26, 27, 28, 29.

Let's check each number to see if it is prime:

- 21 is not prime (divisible by 3 and 7).

- 22 is not prime (divisible by 2 and 11).

- 23 is prime (not divisible by any number other than 1 and 23).

- 24 is not prime (divisible by 2, 3, 4, 6, 8, and 12).

- 25 is not prime (divisible by 5).

- 26 is not prime (divisible by 2 and 13).

- 27 is not prime (divisible by 3 and 9).

- 28 is not prime (divisible by 2, 4, 7, and 14).

- 29 is prime (not divisible by any number other than 1 and 29).

The prime numbers between 20 and 30 are 23 and 29.

Now, we sum these prime numbers:

 23 + 29 = 52