Multiple choice general knowledge math & puzzles

What is extremely special about these two numbers: 220 and 284? They are ______ pairs.

  1. Amicable

  2. Rational

  3. Imiginary

  4. None of the above

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A Correct answer
Explanation

Amicable numbers are two different numbers related such that the sum of the proper divisors of each is equal to the other. For 220, divisors sum to 284; for 284, divisors sum to 220. This was discovered by Pythagoras.