Write a C program to find the number is an Abundant number or not:- In this program to find a number is an Abundant number or not. A number n is said to be an Abundant Number to follow these condition the sum of its proper di visors is greater than the number itself. And the difference between these two values is called abundance. Ex:- Abundant number 12 having a proper divisor is 1,2,3,4,6 the sum of these factors is 16 it is greater than 12 so it is an Abundant number. Some other abundant numbers 18, 20, 24, 30, 36, 66, 70, 72, 78, 80, 84, 88, 90, 96, 100, 102, 104, 108, 112, 114, 120.. ALGORITHMS:- Step 1 - Enter the number, to find the Abundant number. Step 2 - Initialize the loop with c=1 to c<=number and follow the following calculation (i) check if whether the number is divisible with c and c got a result zero. (ii) now sum=sum+c, add a digit into a sum and store it in the sum. Step 3 . then the...