None
1 x 21 3 x 7 7 x 3 21 x 1
30x1 15x2 10x3
If you are talking about factors, 1 and 61, because 61 is a prime number.
As a product of its prime factors: 2*3*3*5 = 90
It is a square number because 20 times 20 = 400
None
1 x 21 3 x 7 7 x 3 21 x 1
30x1 15x2 10x3
10*4=40
1 times 4
-2 x 3
1*114 = 114 is one such fact.
If a number is divisible by both 4 and 5, it's divisible by 20.
1 x 100, 2 x 50, 4 x 25, 5 x 20, 10 x 10 = 100
1 x 25, 5 x 5.
There are infinitely many facts. Some of these are: 1 * 10 100 * 0.2 50 * 0.4