@extra-number/aliquot-sum (npm): Gives sum of all proper divisors of n (see aliquot sum).
Keywords: extra|number|aliquot|sum|aliquotSum|aliquot-sum|arithmetic-mean|binomial|ceil|ceil-div|compare|constrain|cubic-mean|degrees|factorial|floor|floor-div|gcd|geometric-mean|harmonic-mean|is|is-pow|is-prime