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20 in words

20

twenty

20 is written twenty.

Ways to write it

As an ordinal: twentieth
Roman numeral: XX
Expanded form: 20

Place value

Place	Digit	Value
tens	2	20
ones	0	0

Number facts

Even or odd: Even
Prime or composite: Composite
Factors: 1, 2, 4, 5, 10 and 20 (6 factors)
First 10 multiples: 20, 40, 60, 80, 100, 120, 140, 160, 180, 200
Square: 20 × 20 = 400
Square root: ≈ 4.47
Sum of the digits: 2 + 0 = 2
Rounded to the nearest 10: 20
Number before: 19
Number after: 21
In binary: 10100

Quick check

What number comes just after 20?
Show the answer
21
Is 20 even or odd?
Show the answer
Even
What is 20 + 10?
Show the answer
30

Practise with a game

Count with Me

Count pictures up to 5, 10 or 20 and compare groups.

Place Value Quest

Ones, tens, hundreds and thousands.

Times Tables Challenge

Practise any times table from 2× to 12×.

Frequently asked questions

How do you write 20 in words?

20 is written "twenty".

Is 20 a prime number?

No. 20 is a composite number, because it has more than two factors.

What are the factors of 20?

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

How do you write 20 in Roman numerals?

20 in Roman numerals is XX.