Evaluate square root of -20

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Algebra

$\sqrt{- 20}$

Rewrite $- 20$ as $- 1 (20)$ .

$\sqrt{- 1 (20)}$

Rewrite $\sqrt{- 1 (20)}$ as $\sqrt{- 1} \cdot \sqrt{20}$ .

$\sqrt{- 1} \cdot \sqrt{20}$

Rewrite $\sqrt{- 1}$ as $i$ .

$i \cdot \sqrt{20}$

Rewrite $20$ as $2^{2} \cdot 5$ .

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Factor $4$ out of $20$ .

$i \cdot \sqrt{4 (5)}$

Rewrite $4$ as $2^{2}$ .

$i \cdot \sqrt{2^{2} \cdot 5}$

Pull terms out from under the radical.

$i \cdot (2 \sqrt{5})$

Move $2$ to the left of $i$ .

$2 i \sqrt{5}$

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Name

Name	three hundred fourteen million eighty-three thousand three hundred eighteen

Interesting facts

314083318 has 8 divisors, whose sum is 471822912
The reverse of 314083318 is 813380413
Previous prime number is 677

Basic properties

Is Prime? no
Number parity even
Number length 9
Sum of Digits 31
Digital Root 4

Name

Name	six hundred thirty-nine million five hundred forty-two thousand nine hundred seventy-two

Interesting facts

639542972 has 16 divisors, whose sum is 1440305280
The reverse of 639542972 is 279245936
Previous prime number is 1087

Basic properties

Is Prime? no
Number parity even
Number length 9
Sum of Digits 47
Digital Root 2

Name

Name	one billion four hundred eighteen million five hundred twenty-six thousand eight hundred fifteen

Interesting facts

1418526815 has 16 divisors, whose sum is 1760705856
The reverse of 1418526815 is 5186258141
Previous prime number is 41

Basic properties

Is Prime? no
Number parity odd
Number length 10
Sum of Digits 41
Digital Root 5

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