21503531

素因数分解:

$7^1\times {\mathrm{53}}^1\times {\mathrm{149}}^1\times {\mathrm{389}}^1$

素因数の和:598

約数の個数: 16

約数和(自身を含む): 25272000

約数和(自身を除く): 3768469

約数列:

[1, 7, 53, 149, 371, 389, 1043, 2723, 7897, 20617, 55279, 57961, 144319, 405727, 3071933, 21503531]

約数ペア:

[(1, 21503531), (7, 3071933), (53, 405727), (149, 144319), (371, 57961), (389, 55279), (1043, 20617), (2723, 7897)]