21008770

素因数分解:

$2^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{123581}}^1$

素因数の和:123605

約数の個数: 16

約数和(自身を含む): 40040568

約数和(自身を除く): 19031798

約数列:

[1, 2, 5, 10, 17, 34, 85, 170, 123581, 247162, 617905, 1235810, 2100877, 4201754, 10504385, 21008770]

約数ペア:

[(1, 21008770), (2, 10504385), (5, 4201754), (10, 2100877), (17, 1235810), (34, 617905), (85, 247162), (170, 123581)]