21386405

素因数分解:

$5^1\times {\mathrm{103}}^1\times {\mathrm{131}}^1\times {\mathrm{317}}^1$

素因数の和:556

約数の個数: 16

約数和(自身を含む): 26193024

約数和(自身を除く): 4806619

約数列:

[1, 5, 103, 131, 317, 515, 655, 1585, 13493, 32651, 41527, 67465, 163255, 207635, 4277281, 21386405]

約数ペア:

[(1, 21386405), (5, 4277281), (103, 207635), (131, 163255), (317, 67465), (515, 41527), (655, 32651), (1585, 13493)]