The only one that can't is 23.
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20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
There is an infinite number of numbers between 0 and 20.
There are an infinite number of 3d shapes with more than 20 faces.
The only square number between 20 and 30 is 25.
1 is between 20 and 18 on a dartboard.