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There are infinitely many whole numbers which are greater than 20.
23 and 29 are the two prime numbers greater than 20 but less than 30.
There are infinitely many whole numbers greater than 20. The first of these is 21.
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
21 and 22.