Program to check whether given two numbers are Amicable or not
Amicable numbers are pair of those two numbers so related that sum of the proper divisors of the one is equal
to the other for example (220,284). Propser divisors of 220 are 1,2,4,5,10,11,20,22,44,55, and 110 and the sum of these
is 284; and proper divisors of 284 are 1,2,4,71, and 142 and sum of these numbers is 220
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/*Program to check whether given two numbers are Amicable or not*/ 
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#include <stdio.h> 
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#include <conio.h> 
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void main() 
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{ 
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int num1,num2,i,sum_n1=0,sum_n2=0; 
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printf("****Programme to check whether given two numbers are Amicable or not****"); 
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//Take two numbers from user 
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printf("Enter Number1: "); 
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scanf("%d",&num1); 
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printf("Enter Number2: "); 
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scanf("%d",&num2); 
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//Calculate the sum of proper divisors of num1 
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printf("%d > ",num1); 
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for(i=1; i<=num1/2; i++) 
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{ 
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if(num1%i==0) 
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{ 
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printf("%d + ",i); 
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sum_n1=sum_n1+i; 
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} 
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} 
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printf(" = %d",sum_n1); 
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printf(""); 
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//Calculate the sum of proper divisors of num2 
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printf("%d > ",num2); 
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for(i=1; i<=num2/2; i++) 
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{ 
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if(num2%i==0) 
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{ 
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printf("%d + ",i); 
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sum_n2=sum_n2+i; 
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} 
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} 
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printf(" = %d",sum_n2); 
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//Check the sum of num1's divisors and num2's divisors 
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if(sum_n1==num2 && sum_n2==num1) 
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{ 
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printf("Yes Amicable Number"); 
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} 
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else 
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{ 
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printf("No Not Amicable Numbers"); 
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} 
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getch(); 
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} 