The number 20122
20122 is a composite number with 4 divisors. Its prime factorisation is 2 × 10061. Divisors (4): 1, 2, 10061, 20122.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 20122: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 10061, the product of two primes.
- 2
20122 is composite. Its prime factorisation is
- 3
The divisors add up to 30186; without 20122 itself that is 10064, so 20122 is deficient (10064 is less than 20122). Euler's totient φ(20122) = 10060 numbers up to 20122 share no factor with it.
- 4
The digits of 20122 add up to 7, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 43 steps to reach 1.
LaTeX source of the formulas on this page
\[ 20122 = 2 \times 10061 \]
20122 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 30186 |
| Euler totient φ(n) | 10060 |
| Square | 404894884 |
| Cube | 8147294855848 |
| Square root | 141.852036 |
| Digit sum / digital root | 7 / 7 |
| Collatz steps to 1 | 43 |
| Scientific notation | 2.0122 × |
20122 in other forms
| Form | Value |
|---|---|
| In words | twenty thousand one hundred and twenty-two |
| Binary (base 2) | 100111010011010 |
| Octal (base 8) | 47232 |
| Hexadecimal (base 16) | 4E9A |
| Base 3 | 1000121021 |
| As time | 20122 seconds = 5 h 35 min 22 s |
Is 20122 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (20122 ÷ 2 = 10061) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | 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 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 20122 a prime number?
No. 20122 = 2 × 10061, so it is divisible by 2.
What are the factors of 20122?
1, 2, 10061, 20122.
What is 20122 in binary?
100111010011010 (hexadecimal 4E9A, octal 47232).
What is the square root of 20122?
About 141.8520.
Is 20122 divisible by 3?
No. Its digits add up to 7, which is not a multiple of 3.
What is special about the number 20122?
20122 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 10061, the product of two primes.