21165815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{53}}^2\times {\mathrm{137}}^1$

素因数の和:259

約数の個数: 24

約数和(自身を含む): 28446768

約数和(自身を除く): 7280953

約数列:

[1, 5, 11, 53, 55, 137, 265, 583, 685, 1507, 2809, 2915, 7261, 7535, 14045, 30899, 36305, 79871, 154495, 384833, 399355, 1924165, 4233163, 21165815]

約数ペア:

[(1, 21165815), (5, 4233163), (11, 1924165), (53, 399355), (55, 384833), (137, 154495), (265, 79871), (583, 36305), (685, 30899), (1507, 14045), (2809, 7535), (2915, 7261)]