If n > 1 is a composite number, then σ(n) > n+sqrt(n).
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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If n > 1 is a composite number, then σ(n) > n+sqrt(n).
[Hint: Let d/n, where 1 < d < n, so 1 < n/d < n. If d is smaller than or equal to sqrt(n), then n/d is greater than or equal to sqrt(n)].
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