Ten is not abundant because the sum of its proper factors is less than itself.
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The sum of the factors of 10 (excluding itself) is equal to 1 + 2 + 5 = 8. Therefore, since its factor sum is less than the number itself, 10 is a deficient number. The lowest abundant number is 12.
Yes 20 is an ABUNDANT number because 1+2+4+5+10=22 and that is more than 20. PS how to find and ABUNDANT number is to add up all its factors. :)
60 is abundant.
72 is an abundant number.
67 is an abundant number.