20: 1, 2, 4, 5, 10, 20
30: 1, 2, 3, 5, 6, 10, 15, 30
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1, 2, 3, 5, 6, 10, 15, and 30.
The range from 20 to 30 includes all whole numbers from 20 up to and including 30. In mathematical notation, this can be represented as [20, 30]. This range contains 11 numbers: 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30.
Prime numbers between the given numbers are 23 and 29
Out of that group, only 30
Because the other numbers have more than two factors