The only square number between 20 and 30 is 25.
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The only square number of an integer between 20 and 30 is 25, which is equal to the square of ±5.
All of the integers between 20 and 30 are square roots.
36 is the square number between 30 and 45
20 is between 10 and 30.
4
20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.