perfect square numbers are 16 and 25
28 is a perfect number.
20 is between 10 and 30.
The perfect cubes between 10 and 30 are 27, which is the cube of 3 (3^3). The next perfect cube, 64 (4^3), exceeds 30, while the perfect cubes below 10 are 1 (1^3) and 8 (2^3). Therefore, 27 is the only perfect cube in that range.
36
-10
28 is a perfect number.
The two perfect numbers between 1 and 30 are: 6, 28
20 is between 10 and 30.
The number is 28.
The perfect cubes between 10 and 30 are 27, which is the cube of 3 (3^3). The next perfect cube, 64 (4^3), exceeds 30, while the perfect cubes below 10 are 1 (1^3) and 8 (2^3). Therefore, 27 is the only perfect cube in that range.
30
36
-10
The perfect number between 20 and 30 is 28. A perfect number is defined as a positive integer that is equal to the sum of its proper divisors, excluding itself. For 28, the divisors are 1, 2, 4, 7, and 14, which add up to 28. Thus, 28 is the only perfect number in that range.
The numbers between 10 and 30 that have exactly 5 factors are 16 and 25. The number 16 has factors 1, 2, 4, 8, and 16. The number 25 has factors 1, 5, 25, but since it is a perfect square, it also includes the repeated factor of 5. These are the only two numbers between 10 and 30 that have exactly 5 factors.
It is 28 I did that at school in year 6
25 is a perfect square occurring between 20 and 30.