20,640 in words
20,640
twenty thousand six hundred forty
20,640 is written twenty thousand six hundred forty.
Ways to write it
- As an ordinal
- twenty thousand six hundred fortieth
- Expanded form
- 20,000 + 600 + 40
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 0 | 0 |
| hundreds | 6 | 600 |
| tens | 4 | 40 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 43, 48, 60, 80, 86, 96, 120, 129, 160, 172, 215, 240, 258, 344, 430, 480, 516, 645, 688, 860, 1,032, 1,290, 1,376, 1,720, 2,064, 2,580, 3,440, 4,128, 5,160, 6,880, 10,320 and 20,640 (48 factors)
- First 10 multiples
- 20,640, 41,280, 61,920, 82,560, 103,200, 123,840, 144,480, 165,120, 185,760, 206,400
- Square
- 20,640 × 20,640 = 426,009,600
- Square root
- ≈ 143.67
- Sum of the digits
- 2 + 0 + 6 + 4 + 0 = 12
- Rounded to the nearest 10
- 20,640
- Rounded to the nearest 100
- 20,600
- Rounded to the nearest 1000
- 21,000
- Number before
- 20,639
- Number after
- 20,641
- In binary
101000010100000
Quick check
What number comes just after 20,640?
Show the answer
20,641
Is 20,640 even or odd?
Show the answer
Even
What is 20,640 + 10?
Show the answer
20,650
Practice 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 20,640 in words?
20,640 is written "twenty thousand six hundred forty".
Is 20,640 a prime number?
No. 20,640 is a composite number, because it has more than two factors.
What are the factors of 20,640?
The factors of 20,640 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 43, 48, 60, 80, 86, 96, 120, 129, 160, 172, 215, 240, 258, 344, 430, 480, 516, 645, 688, 860, 1,032, 1,290, 1,376, 1,720, 2,064, 2,580, 3,440, 4,128, 5,160, 6,880, 10,320 and 20,640.