The number 20427
20427 is a composite number with 8 divisors. Its prime factorisation is 3 × 11 × 619. Divisors (8): 1, 3, 11, 33, 619, 1857, 6809, 20427.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
20427 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
20427 is composite. Its prime factorisation is
- 3
The divisors add up to 29760; without 20427 itself that is 9333, so 20427 is deficient (9333 is less than 20427). Euler's totient φ(20427) = 12360 numbers up to 20427 share no factor with it.
- 4
The digits of 20427 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 43 steps to reach 1.
LaTeX source of the formulas on this page
\[ 20427 = 3 \times 11 \times 619 \]
20427 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 29760 |
| Euler totient φ(n) | 12360 |
| Square | 417262329 |
| Cube | 8523417594483 |
| Square root | 142.923056 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 43 |
| Scientific notation | 2.0427 × |
20427 in other forms
| Form | Value |
|---|---|
| In words | twenty thousand four hundred and twenty-seven |
| Binary (base 2) | 100111111001011 |
| Octal (base 8) | 47713 |
| Hexadecimal (base 16) | 4FCB |
| Base 3 | 1001000120 |
| As time | 20427 seconds = 5 h 40 min 27 s |
Is 20427 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (20427 ÷ 3 = 6809) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (20427 ÷ 11 = 1857) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 20427 a prime number?
No. 20427 = 3 × 11 × 619, so it is divisible by 3.
What are the factors of 20427?
1, 3, 11, 33, 619, 1857, 6809, 20427.
What is 20427 in binary?
100111111001011 (hexadecimal 4FCB, octal 47713).
What is the square root of 20427?
About 142.9231.
Is 20427 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 20427?
It is a composite number with 8 divisors.