The least non zero multiple of any number is .

The number of factors of a given number are infinite.

Every number is a multiple of $1$.

$6$ is a factor of $27$.

The largest $2$- digit multiple of $9$ is $99$.

There exists a natural number which has no factor at all.

List all the factors of :

$8$

List all the factors of :

$18$

List all the factors of :

$23$