21780004

素因数分解:

$2^2\times {\mathrm{19}}^1\times {\mathrm{179}}^1\times {\mathrm{1601}}^1$

素因数の和:1803

約数の個数: 24

約数和(自身を含む): 40370400

約数和(自身を除く): 18590396

約数列:

[1, 2, 4, 19, 38, 76, 179, 358, 716, 1601, 3202, 3401, 6404, 6802, 13604, 30419, 60838, 121676, 286579, 573158, 1146316, 5445001, 10890002, 21780004]

約数ペア:

[(1, 21780004), (2, 10890002), (4, 5445001), (19, 1146316), (38, 573158), (76, 286579), (179, 121676), (358, 60838), (716, 30419), (1601, 13604), (3202, 6802), (3401, 6404)]