1. A Perfect Number N is a number whose sum of the proper divisors is equal to N. The proper divisors are the numbers that are evenly divisible to N from 1 to N-1.
1 2 4 7 14 are the proper divisors of 28.

The sum of this number is 28, which is N itself, therefore, 28 is called a PERFECT NUMBER. If the sum of the proper divisors of N is less than N, then N is a Deficient Number. If the sum of the proper divisors of N is more than N, then N is Abundant Number.

Write a program that allows the user to enter the value of N and then displays the result indicating whether the number entered is perfect, deficient or abundant.
Sample Run:
Input a number: 16
The proper divisors of 16 are:
1 2 4 8
Sum of the proper divisors = 15
Therefore, 16 is a deficient number.




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I write an algorithm. You can write the program.
This is a simple program. Not efficient in computation. you can replace the comparison K < N  by    K <=  (N+1)/2         that is more efficient.
It can be made more efficient by K < square root (N).  But print K and N/K at the same time.  output for N = 32 looks like  1 2 16 4 8 16 

Algorithm Perfect 

   N: Integer - input data
   K : integer   -  current divisor
   Sum : integer - sum of factors

      Print "Input a number : "
      Input N
      Print " The proper divisors of " , N, " are " 
      K = 1
      Sum = 0
        While K <= N do 
                If ( N % K ) = 0  then  // reminder is 0.   K<= (N+1)/2 is more efficient.
                       Print K 
                      Sum = Sum + K
               end if 
              K = K + 1
       end while

      print "Sum of the proper divisors is "  ,  Sum , " Hence "  ,  N 

     If (Sum = N ) then
            Print   " is a  perfect number "
     else if  (Sum < N ) then
          Print   " is a deficient number  "
         print " is an abundant number "
     end if

end perfect