81215981

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{2843}}^1$

素因数の和:2921

約数の個数: 24

約数和(自身を含む): 105045984

約数和(自身を除く): 23830003

約数列:

[1, 7, 11, 49, 53, 77, 371, 539, 583, 2597, 2843, 4081, 19901, 28567, 31273, 139307, 150679, 218911, 1054753, 1532377, 1657469, 7383271, 11602283, 81215981]

約数ペア:

[(1, 81215981), (7, 11602283), (11, 7383271), (49, 1657469), (53, 1532377), (77, 1054753), (371, 218911), (539, 150679), (583, 139307), (2597, 31273), (2843, 28567), (4081, 19901)]