+**220** is a natural number, famously known as the smaller half of the first [amicable number](/wiki/Amicable_Number) pair, sharing a unique bond with 284 through the sum of their proper [divisors](/wiki/Divisor). Beyond this mathematical elegance, it also commonly represents a standard [voltage](/wiki/Voltage) in electrical systems across many parts of the world.
+## See also
+- [Number](/wiki/Number)
+- [284](/wiki/284)
+- [Electricity](/wiki/Electricity)
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