Square Root Calculator › Square root of 20
Square Root of 20
√20 ≈ 4.472136
20 is not a perfect square, so √20 is an irrational number that is approximately 4.472136. In simplified radical form, √20 = 2√5.
√20 lies between √16 = 4 and √25 = 5.
| Number | 20 |
| Square root (decimal) | 4.472136 |
| Simplified radical | 2√5 |
| Perfect square? | No |
| Rational? | No |
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Frequently asked questions
Is 20 a perfect square?
No, 20 is not a perfect square, so its square root is irrational and approximately 4.472136.
What is the square root of 20 in simplest radical form?
√20 = 2√5 in simplest radical form.