It is: 31
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23 and 29
There are infinitely many prime numbers which are greater than 30.
23 and 29 are the two prime numbers greater than 20 but less than 30.
15 is a number greater than 10 and a factor of 30.
The prime number between 20 and 30 whose ones digit is 7 greater than its tens digit is 23. The tens digit is 2, and the ones digit is 3, which is 7 greater than 2. Additionally, 23 is a prime number because it is only divisible by 1 and itself, with no other factors.