21918767

素因数分解:

${\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{137}}^1\times {\mathrm{397}}^1$

素因数の和:578

約数の個数: 16

約数和(自身を含む): 24605952

約数和(自身を除く): 2687185

約数列:

[1, 13, 31, 137, 397, 403, 1781, 4247, 5161, 12307, 54389, 55211, 159991, 707057, 1686059, 21918767]

約数ペア:

[(1, 21918767), (13, 1686059), (31, 707057), (137, 159991), (397, 55211), (403, 54389), (1781, 12307), (4247, 5161)]