20,990 in words
20,990
twenty thousand nine hundred ninety
20,990 is written twenty thousand nine hundred ninety.
Ways to write it
- As an ordinal
- twenty thousand nine hundred ninetieth
- Expanded form
- 20,000 + 900 + 90
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 0 | 0 |
| hundreds | 9 | 900 |
| tens | 9 | 90 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 5, 10, 2,099, 4,198, 10,495 and 20,990 (8 factors)
- First 10 multiples
- 20,990, 41,980, 62,970, 83,960, 104,950, 125,940, 146,930, 167,920, 188,910, 209,900
- Square
- 20,990 × 20,990 = 440,580,100
- Square root
- ≈ 144.88
- Sum of the digits
- 2 + 0 + 9 + 9 + 0 = 20
- Rounded to the nearest 10
- 20,990
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 20,989
- Number after
- 20,991
- In binary
101000111111110
Quick check
What number comes just after 20,990?
Show the answer
20,991
Is 20,990 even or odd?
Show the answer
Even
What is 20,990 + 10?
Show the answer
21,000
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Number Patterns
Find the missing number in a sequence.Frequently asked questions
How do you write 20,990 in words?
20,990 is written "twenty thousand nine hundred ninety".
Is 20,990 a prime number?
No. 20,990 is a composite number, because it has more than two factors.
What are the factors of 20,990?
The factors of 20,990 are 1, 2, 5, 10, 2,099, 4,198, 10,495 and 20,990.