21000388617

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{19943389}}^1$

素因数の和:19943414

約数の個数: 20

約数和(自身を含む): 33784102660

約数和(自身を除く): 12783714043

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 351, 1053, 19943389, 59830167, 179490501, 259264057, 538471503, 777792171, 1615414509, 2333376513, 7000129539, 21000388617]

約数ペア:

[(1, 21000388617), (3, 7000129539), (9, 2333376513), (13, 1615414509), (27, 777792171), (39, 538471503), (81, 259264057), (117, 179490501), (351, 59830167), (1053, 19943389)]