Semiperfect Number is not Deficient
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Theorem
Let $n \in \Z_{>0}$ be a semiperfect number.
Then $n$ is not deficient.
Proof
Let $n$ be semiperfect.
Then by definition, the sum of the aliquot parts of $n$ is not less than $n$.
The result follows by definition of deficient.
$\blacksquare$