There are many greater than 20, a better questions would've been "what prime numbers are less than 20".
The first Prime number greater than 20 is 23.
The prime numbers to 100 are
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
23 is the smallest prime number greater than 20.
23
23 and 29 are the prime numbers between 20 and 30.
The numbers 23 and 29 are prime.
11, 13, 17, 19
23 is the smallest prime number greater than 20.
The prime number that is greater than 20 but less than 29 is 23.
23
20 is the next number greater than 19. The next prime number greater than 19 is 23.
23 and 29 are the prime numbers between 20 and 30.
23
23 and 29
25 is the number not less than 20, not greater than 40, not divisible by 2 3 or 7, and not a prime number.
21 = 3x7 ... not prime. 22 = 2x11 ... not prime. 23 is prime. 23.
23 29 31.
No number is less than 20 and greater than 40, but if you switch them around, your answer is 25.
11 + 101 = 112