Is 20720 a prime number?

20 720 is an even number, because it is evenly divisible by 2: 20 720 / 2 = 10 360.

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• What is an even number?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 20 720 is about 143.944.

Thus, the square root of 20 720 is not an integer, and therefore 20 720 is not a square number.

The square of a number (here 20 720) is the result of the product of this number (20 720) by itself (i.e., 20 720 × 20 720); the square of 20 720 is sometimes called "raising 20 720 to the power 2", or "20 720 squared".

The square of 20 720 is 429 318 400 because 20 720 × 20 720 = 20 720² = 429 318 400.

As a consequence, 20 720 is the square root of 429 318 400.

20 720 is a number with 5 digits.

The multiples of 20 720 are all integers evenly divisible by 20 720, that is all numbers such that the remainder of the division by 20 720 is zero. There are infinitely many multiples of 20 720. The smallest multiples of 20 720 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 20 720 too, since 0 × 20 720 = 0
• 20 720: indeed, 20 720 is a multiple of itself, since 20 720 is evenly divisible by 20 720 (we have 20 720 / 20 720 = 1, so the remainder of this division is indeed zero)
• 41 440: indeed, 41 440 = 20 720 × 2
• 62 160: indeed, 62 160 = 20 720 × 3
• 82 880: indeed, 82 880 = 20 720 × 4
• 103 600: indeed, 103 600 = 20 720 × 5
• etc.

• Preceding numbers: …20 718, 20 719
• Following numbers: 20 721, 20 722…

Nearest numbers from 20 720

• Preceding prime number: 20 719
• Following prime number: 20 731

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• 20 720 est-il un nombre premier ?