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 220 and 284 are amicable pairs because the sum of proper divisors of 220 (1+2+4+5+10+11+20+22+44+55+110=284) equals 284, and vice versa. This is the smallest known amicable pair.