Including 20 and 30 there are ten of them
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The prime numbers between 20 and 30 are 23 and 29.
There are no integer palindromes between 1,000 and 9,000 that are divisible by 20.
All of them except 23 and 29 which are prime numbers having only two factors
There are 20 integer palindromes between 10,000 and 99,999 that are divisible by 25.
A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.