A to F   G to M   N to T   U to Z   See also: - Factor - Perfect Number Maths Friendly Numbers Friendly number are pairs of numbers where they both share the same sum of factors as each other. For example, 220 and 284 (1+2+4+5+10+11+20+22+44+55+110=284 and 1+2+4+71+142=220). Also amicable numbers.

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