21008813

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{137}}^1\times {\mathrm{1153}}^1$

素因数の和:1316

約数の個数: 16

約数和(自身を含む): 25480320

約数和(自身を除く): 4471507

約数列:

[1, 7, 19, 133, 137, 959, 1153, 2603, 8071, 18221, 21907, 153349, 157961, 1105727, 3001259, 21008813]

約数ペア:

[(1, 21008813), (7, 3001259), (19, 1105727), (133, 157961), (137, 153349), (959, 21907), (1153, 18221), (2603, 8071)]