The number 620
620 is a composite number with 12 divisors. Its prime factorisation is × 5 × 31. Divisors (12): 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
620 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
620 is composite. Its prime factorisation is
- 3
The divisors add up to 1344; without 620 itself that is 724, so 620 is abundant (724 is more than 620). Euler's totient φ(620) = 240 numbers up to 620 share no factor with it.
- 4
The digits of 620 add up to 8, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 87 steps to reach 1.
LaTeX source of the formulas on this page
\[ 620 = 2^{2} \times 5 \times 31 \]620 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 1344 |
| Euler totient φ(n) | 240 |
| Square | 384400 |
| Cube | 238328000 |
| Square root | 24.899799 (= 2√155) |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 87 |
| Scientific notation | 6.2 × |
620 in other forms
| Form | Value |
|---|---|
| In words | six hundred and twenty |
| Roman numerals | DCXX |
| Binary (base 2) | 1001101100 |
| Octal (base 8) | 1154 |
| Hexadecimal (base 16) | 26C |
| Base 3 | 211222 |
| As time | 620 seconds = 10 min 20 s |
Is 620 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (620 ÷ 2 = 310) | 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 | Yes (620 ÷ 4 = 155) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (620 ÷ 5 = 124) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | 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 4) | 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 | Yes (620 ÷ 10 = 62) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 620 a prime number?
No. 620 = × 5 × 31, so it is divisible by 2.
What are the factors of 620?
1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620.
What is 620 in binary?
1001101100 (hexadecimal 26C, octal 1154).
What is the square root of 620?
About 24.8998, exactly 2√155.
What is 620 in Roman numerals?
DCXX.
Is 620 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 620?
It is a composite number with 12 divisors.