Numbers ending in zero are all multiples of 10, and therefore also are multiples of 2 and 5.
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Even. All numbers ending in 2, 4, 6, 8, or 0 are even; all numbers ending in 1, 3, 5, 7, or 9 are odd.
For a number to have [only] 2 factors, it must be a prime number; the prime numbers between 0 and 20 are; 2, 3, 5, 7, 11, 13, 17, 19
It's an odd number. Even numbers, when divided by two will always give the answer as a whole number. Odd numbers do not. Numbers ending in 0, 2, 4, 6, 8 are even, and numbers ending in 1, 3, 5, 7 or 9 are odd.
The numbers 20 and 40 are both multiples of 10, as they can be divided evenly by 10. They are also both even numbers, ending in 0. Additionally, both numbers are divisible by 5, as they end in 0.
What two numbers have the factors 2 4 and 8