21068065

素因数分解:

$5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1$

素因数の和:217

約数の個数: 32

約数和(自身を含む): 27878400

約数和(自身を除く): 6810335

約数列:

[1, 5, 29, 31, 43, 109, 145, 155, 215, 545, 899, 1247, 1333, 3161, 3379, 4495, 4687, 6235, 6665, 15805, 16895, 23435, 38657, 97991, 135923, 145297, 193285, 489955, 679615, 726485, 4213613, 21068065]

約数ペア:

[(1, 21068065), (5, 4213613), (29, 726485), (31, 679615), (43, 489955), (109, 193285), (145, 145297), (155, 135923), (215, 97991), (545, 38657), (899, 23435), (1247, 16895), (1333, 15805), (3161, 6665), (3379, 6235), (4495, 4687)]