It is 18
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If a number, when divided by 6, is more than 5, then the number must be greater than 30 and so cannot be between 29 and 30.
29 - 23 = 6
20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
It's a multiple of 5, a multiple of 6 (since it's between twin primes), and less than 50. The only possibility is 30. To check: The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30
25