21208655

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{1321}}^1$

素因数の和:1371

約数の個数: 24

約数和(自身を含む): 29031120

約数和(自身を除く): 7822465

約数列:

[1, 5, 13, 19, 65, 95, 169, 247, 845, 1235, 1321, 3211, 6605, 16055, 17173, 25099, 85865, 125495, 223249, 326287, 1116245, 1631435, 4241731, 21208655]

約数ペア:

[(1, 21208655), (5, 4241731), (13, 1631435), (19, 1116245), (65, 326287), (95, 223249), (169, 125495), (247, 85865), (845, 25099), (1235, 17173), (1321, 16055), (3211, 6605)]