What is the smallest factor of 20?

Answer 1

20 has four factors less than 6: 1, 2, 4 & 5

A factor of a number is normally defined as a natural number (i.e. a positive integer/positive whole number; thus 0 is not included) which divides into that number giving a natural number as a result. Therefore all natural numbers will have at least 4 factors unless they are prime numbers(which, by definition, only have 2 factors).

The number 20 has the following factors:

1,20,2,10,4 & 5.

Do you see how I have written the factors so that they are paired together as the multiples that give 20? (E.g. 1 and 20 etc... Often you will see factors written as, for example 1 x 20, 2 x 10, 4 x 5).

If we re-order those factors into ascending order we will get:

1,2,4,5,10 & 20.

So those less than 6 are: 1, 2, 4 & 5.

Answer 2

No.

Answer 3

One.

Answer 4

1, 2, 4, 5