Is 1720 a prime number?
No, 1720 is not a prime number. It is divisible by 2: 1720 = 2 × 860.
Is 1720 prime?
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A prime number has exactly two factors: 1 and itself.
- 2
It is enough to test the primes up to √1720 ≈ 41.47. If none of them divides 1720, it is prime.
- 3
2 divides 1720 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 1720 = 2^{3} \times 5 \times 43 \]Testing 1720 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 1720 ÷ 2 | divides exactly (860) |
| 3 | 1720 ÷ 3 | leaves 1 |
| 5 | 1720 ÷ 5 | divides exactly (344) |
| 7 | 1720 ÷ 7 | leaves 5 |
| 11 | 1720 ÷ 11 | leaves 4 |
| 13 | 1720 ÷ 13 | leaves 4 |
| 17 | 1720 ÷ 17 | leaves 3 |
| 19 | 1720 ÷ 19 | leaves 10 |
| 23 | 1720 ÷ 23 | leaves 18 |
| 29 | 1720 ÷ 29 | leaves 9 |
| 31 | 1720 ÷ 31 | leaves 15 |
| 37 | 1720 ÷ 37 | leaves 18 |
Questions
Is 1720 a prime number?
No, 1720 is not a prime number. It is divisible by 2: 1720 = 2 × 860.
What is the next prime after 1720?
1721.
What is the prime number before 1720?
1709.
What are the factors of 1720?
1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720.