28. The sum of its factors (smaller than 28) is 1 + 2 + 4 + 7 + 14 = 28.
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25 is a perfect square occurring between 20 and 30.
The two perfect numbers between 1 and 30 are: 6, 28
25
29
No, only perfect squares like 25 and 36, which are around 30, have a square root that is a rational number.