20128420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{77417}}^1$

素因数の和:77439

約数の個数: 24

約数和(自身を含む): 45521784

約数和(自身を除く): 25393364

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 77417, 154834, 309668, 387085, 774170, 1006421, 1548340, 2012842, 4025684, 5032105, 10064210, 20128420]

約数ペア:

[(1, 20128420), (2, 10064210), (4, 5032105), (5, 4025684), (10, 2012842), (13, 1548340), (20, 1006421), (26, 774170), (52, 387085), (65, 309668), (130, 154834), (260, 77417)]