Write a function int sumDivisors (int number) {...} that takes an integer as a parameter, and returns the sum of its divisors. For example, if the number is 12, it will return 28 (1+2+3+4+6+12). Incorporate the function above in a program that asks the user to enter an integer, calls the function, then displays the result. Rewrite the function above by making parameter number a global variable. Rewrite the function above using passing by reference. The header of the function must be as follows: void sumDivisors (int & result, int number) {...}

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