18420521

素因数分解:

$7^2\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{173}}^1$

素因数の和:281

約数の個数: 24

約数和(自身を含む): 22494024

約数和(自身を除く): 4073503

約数列:

[1, 7, 41, 49, 53, 173, 287, 371, 1211, 2009, 2173, 2597, 7093, 8477, 9169, 15211, 49651, 64183, 106477, 347557, 375929, 449281, 2631503, 18420521]

約数ペア:

[(1, 18420521), (7, 2631503), (41, 449281), (49, 375929), (53, 347557), (173, 106477), (287, 64183), (371, 49651), (1211, 15211), (2009, 9169), (2173, 8477), (2597, 7093)]