21091265

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{67}}^1\times {\mathrm{167}}^1$

素因数の和:281

約数の個数: 32

約数和(自身を含む): 28788480

約数和(自身を除く): 7697215

約数列:

[1, 5, 13, 29, 65, 67, 145, 167, 335, 377, 835, 871, 1885, 1943, 2171, 4355, 4843, 9715, 10855, 11189, 24215, 25259, 55945, 62959, 126295, 145457, 314795, 324481, 727285, 1622405, 4218253, 21091265]

約数ペア:

[(1, 21091265), (5, 4218253), (13, 1622405), (29, 727285), (65, 324481), (67, 314795), (145, 145457), (167, 126295), (335, 62959), (377, 55945), (835, 25259), (871, 24215), (1885, 11189), (1943, 10855), (2171, 9715), (4355, 4843)]