21780188

素因数分解:

$2^2\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{911}}^1$

素因数の和:1097

約数の個数: 24

約数和(自身を含む): 39325440

約数和(自身を除く): 17545252

約数列:

[1, 2, 4, 43, 86, 139, 172, 278, 556, 911, 1822, 3644, 5977, 11954, 23908, 39173, 78346, 126629, 156692, 253258, 506516, 5445047, 10890094, 21780188]

約数ペア:

[(1, 21780188), (2, 10890094), (4, 5445047), (43, 506516), (86, 253258), (139, 156692), (172, 126629), (278, 78346), (556, 39173), (911, 23908), (1822, 11954), (3644, 5977)]