Question

A of any given number is a natural number that divides the given number evenly.

Answer 1

A natural number that divides a number without any remainder is called its factor.

For example,
$20=1\times 4\times 5$
$20=1\times 2\times 10$
$20=1\times 20$

$\therefore$ Factors of $20$ are $1,2,4,5,10$ and $20.$
Let's verify one of these by long division.
Here, the remainder is zero. Therefore, $4$ is a factor of $20.$