Factors of 20 are those numbers that, when multiplied together, give the result of 20. We can also say that a factor is a number that divides a number ultimately, leaving zero as a remainder. We will use the multiplication method to find the factors of 20.

**Factors Calculator**

Factors of 20: 1, 2, 4, 5, 10 and 20

Factors of -20: -1, -2, -4, -5, -10 and -20

Prime Factors of 20: 2, 5

Prime Factorization of 20: 2 × 2 × 5

Factors of 20 in Pairs: (1, 20), (2, 10), and (4, 5)

## What are the factors of 20?

The method of calculating the factors of 20 is as follows. First, each number can be divided by one and by itself.

Consequently, 1 and 20 are the factors of 20.

By dividing a number by 1, 2, 3, 4… we can discover all its factors.

(i) 20 ÷ 1 = 20

This division gives the remainder 0 and so is divisible by 20. So please put them 1 and 20 in your factor list.

1, …….. 20

(ii) 20 ÷ 2 = 10

This division gives the remainder 0 and so is divisible by 10. So please put them 2 and 10 in your factor list.

1, 2 ……..10, 20

(iii) 20 ÷ 3 = 3.33

This division gives the remainder 3.33, not being thoroughly divided. So we will not write 3 and 3.33 on the list.

(iv) 20 ÷ 4 = 5

This division gives the remainder 0 and so is divisible by 5. So please put them 4 and 5 in your factor list.

1, 2, 4 ……..5, 10, 20

(vi) Since we don’t have any more numbers to calculate, we are putting the numbers so far.

So 1, 2, 4, 5, 10 and 20 are factors of 20.

## Factors of -20

To get the factors of -20 by the multiplication method, we will first write the number -20 multiplicatively in all possible ways. We can write -20 as follows and we have:

20 = -1 × -20 Therefore, -1, -20 are factors of -20

20 = -2 × -10 Therefore, -2, -10 are factors of -20

20 = -4 × -5 Therefore, -4, -5 are factors of -20

As there are no other ways we can express -20 multiplicative, we will stop now, and we have obtained all the factors of -20.

So, the factors of -20 are -1, -2, -4, -5, -10 and -20.

## All factors of 20

Here is a list of all the positive and negative factors of 20 in numerical order.

1, 2, 4, 5, 10, 20, -1, -2, -4, -5, -10 and -20

Therefore, 1, 2, 4, 5, 10, 20, -1, -2, -4, -5, -10 and -20 are All factors of 20.

## Factor pairs of 20

20 x 1 = 20

2 x 10 = 20

4 x 5 = 20

So, (1, 20), (2, 10), and (4, 5) are factor pairs of 20

## Prime Factorization of 20

20 ÷ 2 = 10

10 ÷ 2 = 5

5 ÷ 5 = 1

Therefore, 2 × 2 × 5 are Prime factorization of 20.

## Factor tree of 20

```
20
/ \
2 10
/ \
2 5
```

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