21287287

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1\times {\mathrm{727}}^1$

素因数の和:870

約数の個数: 16

約数和(自身を含む): 25159680

約数和(自身を除く): 3872393

約数列:

[1, 7, 47, 89, 329, 623, 727, 4183, 5089, 29281, 34169, 64703, 239183, 452921, 3041041, 21287287]

約数ペア:

[(1, 21287287), (7, 3041041), (47, 452921), (89, 239183), (329, 64703), (623, 34169), (727, 29281), (4183, 5089)]