12 (factors: 1, 2, 3, 4, 6, 12) and 18 (factors: 1, 2, 3, 6, 9, 18)
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The number that 30 is ten less than is 40. Half that is 20. So the question becomes "what number is as much more than 10 is less than 20". This is gobbledygook, but if I rephrase to say "what number is as much more than 10 than 10 is less than 20", then since10 is less than 20 by 10, I guess 20.
Oh, dude, that's an easy one. The number with the most factors less than 144 is 120. It has a total of 16 factors, beating out all the other numbers below 144. So, yeah, 120 is the champ in the factor game.
442
It is 19 which is a prime number
The factors of 20 are: 1,2,4,5,10,20 So; 4 and 10 are the even factors of 20 which are greater than 3.