superperfect

English

Etymology

super- +‎ perfect, coined by Suryanarayana in 1969.

Adjective

superperfect (not comparable)

1. (mathematics) Being or relating to a class of positive integers satisfying $\sigma ^{2}(n)=\sigma (\sigma (n))=2n\,,$ where σ is the divisor function. They are a generalization of perfect numbers.