The number 20429
20429 is a composite number with 4 divisors. Its prime factorisation is 31 × 659. Divisors (4): 1, 31, 659, 20429.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 20429: a semiprime: 31 × 659, the product of two primes.
- 2
20429 is composite. Its prime factorisation is
- 3
The divisors add up to 21120; without 20429 itself that is 691, so 20429 is deficient (691 is less than 20429). Euler's totient φ(20429) = 19740 numbers up to 20429 share no factor with it.
- 4
The digits of 20429 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 180 steps to reach 1.
LaTeX source of the formulas on this page
\[ 20429 = 31 \times 659 \]
20429 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 21120 |
| Euler totient φ(n) | 19740 |
| Square | 417344041 |
| Cube | 8525921413589 |
| Square root | 142.930053 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 180 |
| Scientific notation | 2.0429 × |
20429 in other forms
| Form | Value |
|---|---|
| In words | twenty thousand four hundred and twenty-nine |
| Binary (base 2) | 100111111001101 |
| Octal (base 8) | 47715 |
| Hexadecimal (base 16) | 4FCD |
| Base 3 | 1001000122 |
| As time | 20429 seconds = 5 h 40 min 29 s |
Is 20429 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 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 20429 a prime number?
No. 20429 = 31 × 659, so it is divisible by 31.
What are the factors of 20429?
1, 31, 659, 20429.
What is 20429 in binary?
100111111001101 (hexadecimal 4FCD, octal 47715).
What is the square root of 20429?
About 142.9301.
Is 20429 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 20429?
20429 is a semiprime: 31 × 659, the product of two primes.