Multiple choice general knowledge math & puzzles What is extremely special about these two numbers: 220 and 284? They are ______ pairs. Amicable Rational Imiginary None of the above Reveal answer Fill a bubble to check yourself 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.