820 in words
820
eight hundred and twenty
820 is written eight hundred and twenty.
Ways to write it
- As an ordinal
- eight hundred and twentieth
- Roman numeral
- DCCCXX
- Expanded form
- 800 + 20
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 8 | 800 |
| tens | 2 | 20 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410 and 820 (12 factors)
- First 10 multiples
- 820, 1,640, 2,460, 3,280, 4,100, 4,920, 5,740, 6,560, 7,380, 8,200
- Square
- 820 × 820 = 672,400
- Square root
- ≈ 28.64
- Sum of the digits
- 8 + 2 + 0 = 10
- Rounded to the nearest 10
- 820
- Rounded to the nearest 100
- 800
- Number before
- 819
- Number after
- 821
- In binary
1100110100
Quick check
What number comes just after 820?
Show the answer
821
Is 820 even or odd?
Show the answer
Even
What is 820 + 10?
Show the answer
830
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 820 in words?
820 is written "eight hundred and twenty".
Is 820 a prime number?
No. 820 is a composite number, because it has more than two factors.
What are the factors of 820?
The factors of 820 are 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410 and 820.
How do you write 820 in Roman numerals?
820 in Roman numerals is DCCCXX.