21557417

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{257}}^1\times {\mathrm{521}}^1$

素因数の和:808

約数の個数: 16

約数和(自身を含む): 25857792

約数和(自身を除く): 4300375

約数列:

[1, 7, 23, 161, 257, 521, 1799, 3647, 5911, 11983, 41377, 83881, 133897, 937279, 3079631, 21557417]

約数ペア:

[(1, 21557417), (7, 3079631), (23, 937279), (161, 133897), (257, 83881), (521, 41377), (1799, 11983), (3647, 5911)]