20399405

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{18461}}^1$

素因数の和:18496

約数の個数: 16

約数和(自身を含む): 27914544

約数和(自身を除く): 7515139

約数列:

[1, 5, 13, 17, 65, 85, 221, 1105, 18461, 92305, 239993, 313837, 1199965, 1569185, 4079881, 20399405]

約数ペア:

[(1, 20399405), (5, 4079881), (13, 1569185), (17, 1199965), (65, 313837), (85, 239993), (221, 92305), (1105, 18461)]