## almost perfect numberA description sometimes applied to the powers of 2 because the aliquot parts (proper divisors) of 2 sum to 2^{n} - 1. So a power
of 2 is a deficient number (one that is less than the sum of its proper
divisors), but only just. It isn't known whether there is an odd number
^{n}n whose divisors (excluding itself) sum to n - 1.
## Related category• TYPES OF NUMBERS | |||||

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