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Q: The sum of a number and 20?

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It is: 5+15 = 20

No; 20 is an abundant number. S = {1, 2, 4, 5, 10} is the set of all positive divisors of 20, excluding itself. The sum of these divisors = 1+2+4+5+10=22 which is greater than 20. Therefore 20 is an abundant number, not a deficient number. When the sum exceeds the number, the number is abundant. When the sum equals the number, the number is perfect. When the sum is less than the number, the number is deficient.

what is 4 times the sum of a number squared and 3

17 and 3 = 20

1

A single number cannot have a sum or a product - a sum or product is used to compare two or more numbers.

2.5

As the 20 is a whole number and the rest is a decimal number, the answer is: 20.000000001

13 & 7

The sum of a single number is the number itself. But usually the word "sum" is used for adding more than just one number.

2

-20 because -20 + 36 = 16

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