638637531

素因数分解:

$3^1\times 7^3\times {\mathrm{620639}}^1$

素因数の和:620663

約数の個数: 16

約数和(自身を含む): 993024000

約数和(自身を除く): 354386469

約数列:

[1, 3, 7, 21, 49, 147, 343, 1029, 620639, 1861917, 4344473, 13033419, 30411311, 91233933, 212879177, 638637531]

約数ペア:

[(1, 638637531), (3, 212879177), (7, 91233933), (21, 30411311), (49, 13033419), (147, 4344473), (343, 1861917), (1029, 620639)]