21561275

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{647}}^1$

素因数の和:731

約数の個数: 24

約数和(自身を含む): 28283904

約数和(自身を除く): 6722629

約数列:

[1, 5, 25, 31, 43, 155, 215, 647, 775, 1075, 1333, 3235, 6665, 16175, 20057, 27821, 33325, 100285, 139105, 501425, 695525, 862451, 4312255, 21561275]

約数ペア:

[(1, 21561275), (5, 4312255), (25, 862451), (31, 695525), (43, 501425), (155, 139105), (215, 100285), (647, 33325), (775, 27821), (1075, 20057), (1333, 16175), (3235, 6665)]