The sum of the proper divisors of 18 is 21. What is the sum of the proper divisors of 198?
Question:
The sum of the proper divisors of 18 is 21. What is the sum of the proper divisors of 198?
Answer:
Let's think step by step.

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The sum of the proper divisors of 18 is 21. What is the sum of the proper divisors of 198?
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