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A number which is an Integer multiple
of the Sum of its Unitary Divisors
is called a unitary
-multiperfect number. There are no Odd unitary multiperfect numbers.
References
Guy, R. K. ``Unitary Perfect Numbers.''
§B3 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag,
pp. 53-59, 1994.