20, 22, 24, 25, 26, 28, and 30
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Oh, dude, composite numbers are like those numbers at the party that aren't prime, you know? So between 20 and 30, we've got 21, 22, 24, 25, 26, 27, 28, and 30. They're the ones that can be divided by other numbers besides just 1 and themselves. Cool, right?
Composite numbers are numbers that have more than two factors, meaning they can be divided evenly by numbers other than 1 and themselves. Between 20 and 30, the composite numbers are 21, 22, 24, 25, 26, 27, 28, and 30. These numbers can be divided by numbers other than 1 and themselves, such as 2, 3, 4, 5, and 6.
All of them except for 31, 37, 41, 43 and 47 which are prime numbers.
25
23, 29
If you are including 10 and 30 there are 11 even numbers. If you are not counting 10 and 30 there are 9 even numbers between 10 and 30.
It is not possible. The square root of 1254 is 35.41..., therefore there cannot be two numbers between 20 and 30 whose product is 1254.