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The proper factors of 8 are 1,2 and 4.1+2+4=7<8.8 is called a deficient number.Can you find other deficient numbers?

Sagot :

A number is deficient (or defective) if the sum of its factors excluding itself is less than the number.   

Aside from 8, all prime numbers are deficient.

Examples of deficient numbers:

a)  9    Factors: 1, 3
          Add the factors:  1 + 3 = 4,  4 <9, 9 is a deficient number

b)  14  Factors:  1, 2, 7
          Add the factors:  1 + 2 + 7 = 10,  10<14, 14 is a deficient number

c)  15  Factors:  1, 3, 5
          Add the factors:  1+ 3+ 5 = 13,  13< 15,  15 is a deficient number