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20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
If those are feet, and you are talking about a rectangular box, then just multiply the numbers. If the numbers are any other unit (and you are still talking about a rectangular box), then convert each of the numbers to feet first.
Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
The first 20 odd numbers are: 13579111315171921232527293133353739.
The first 20 digets after the dot in pi are: 3.14159265358979323846