Every one of them has an even number of factors.
Listing all of the factors of 60 we get: 1 2 3 4 5 6 10 12 15 20 30 Then removing the even factors, we are left with: 1 3 5 and 15.
Since 12 is a factor of 60, all the factors of 12 are factors of 60.
The composite factors of 60 are: 4, 6, 10, 12, 15, 20, 30, 60.
60, 72, 84, 90 and 96 each have twelve factors.
The sum is 144 if 60 is included, 84 if not.
Every one of them has an even number of factors.
All of them.
the factors of 60 are 1,2,3,4,5,6,10,12,15,20,30,60
2, 4, 6, 10, 12, 20, 30, 60 add up to 144.
All but the square numbers - 53 of them.
Listing all of the factors of 60 we get: 1 2 3 4 5 6 10 12 15 20 30 Then removing the even factors, we are left with: 1 3 5 and 15.
Since 12 is a factor of 60, all the factors of 12 are factors of 60.
The composite factors of 60 are: 4, 6, 10, 12, 15, 20, 30, 60.
The factors of 60 that are not in 45 are 2, 4, 6, 10, 12, 20, 30 and 60
All the factors of 30.
3, 4, 6, 12, 15, 20, 30, 60.