21020155

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{331}}^1\times {\mathrm{977}}^1$

素因数の和:1326

約数の個数: 16

約数和(自身を含む): 27274464

約数和(自身を除く): 6254309

約数列:

[1, 5, 13, 65, 331, 977, 1655, 4303, 4885, 12701, 21515, 63505, 323387, 1616935, 4204031, 21020155]

約数ペア:

[(1, 21020155), (5, 4204031), (13, 1616935), (65, 323387), (331, 63505), (977, 21515), (1655, 12701), (4303, 4885)]