Because dividing it by two leaves a remainder of zero.
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20 is an even number
If you add an even number with another even number, you will always get the sum as an even number. Ex: 22 + 44 = 66
21+9=20
16 is an even number from 10 to 20, and its square roots are -4 and +4.
No, 20 is not a prime number. It is divisible by 2, 4, 5, and 10, in addition to 1 and 20.