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A number is abundant if the sum of its factors is greater than twice the number.
So in the range given there are 3 and they are:
12, 18 & 20 as:
12 has factors of 1,12,2,6,3,4 which total 28. 28 > (2 * 12)
18 has factors of 1,18,2,9,3,6 which total 39. 39 > (2 * 18)
20 has factors of 1,20,2,10,4,5 which total 42. 42 > (2 * 20)
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What numbers between 2 and 30 are abundant?
12, 18, 20, 24, 30
How many odd numbers are there between 19 and 57?
There are 20 odd numbers between 19 and 57
How many natural numbers between 32 and 53?
There are 20 natural numbers between 32 and 53.
How many odd numbers are there between 20 and 50?
half of (50 - 20)
How many prime numbers 20 and 30?
There are two prime numbers between 20 and 30 which are 23 and 29
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