The only one that can't is 23.
20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
Rectangular numbers, also known as oblong numbers or pronic numbers, are the product of two consecutive integers. The rectangular numbers between 2 and 40 are 6 (2×3), 12 (3×4), 20 (4×5), 30 (5×6), and 42 (6×7). However, since 42 exceeds 40, the rectangular numbers between 2 and 40 are 6, 12, 20, and 30.
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.
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.
If you define a rectangular number as a number which is the product of two consecutive integers, none of them qualify.
20 tiles.
47 is the largest prime number between 20 and 50.
There are an infinite number of 3d shapes with more than 20 faces.
The prime numbers and the squares of primes between 2 and 20: 3, 4, 5, 7, 9, 11, 13, 17 and 19.
The only square number between 20 and 30 is 25.
1 is between 20 and 18 on a dartboard.
30 is the only number between 20 and 50 that is a factor of 60
Any number between 20 and 22.36
the number between 2 and 20 is 11