420 in words
420
four hundred and twenty
420 is written four hundred and twenty.
Ways to write it
- As an ordinal
- four hundred and twentieth
- Roman numeral
- CDXX
- Expanded form
- 400 + 20
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 4 | 400 |
| tens | 2 | 20 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210 and 420 (24 factors)
- First 10 multiples
- 420, 840, 1,260, 1,680, 2,100, 2,520, 2,940, 3,360, 3,780, 4,200
- Square
- 420 × 420 = 176,400
- Square root
- ≈ 20.49
- Sum of the digits
- 4 + 2 + 0 = 6
- Rounded to the nearest 10
- 420
- Rounded to the nearest 100
- 400
- Number before
- 419
- Number after
- 421
- In binary
110100100
Quick check
What number comes just after 420?
Show the answer
421
Is 420 even or odd?
Show the answer
Even
What is 420 + 10?
Show the answer
430
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 420 in words?
420 is written "four hundred and twenty".
Is 420 a prime number?
No. 420 is a composite number, because it has more than two factors.
What are the factors of 420?
The factors of 420 are 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210 and 420.
How do you write 420 in Roman numerals?
420 in Roman numerals is CDXX.