21197360

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1031}}^1$

素因数の和:1301

約数の個数: 40

約数和(自身を含む): 49523616

約数和(自身を除く): 28326256

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 1028, 1031, 1285, 2056, 2062, 2570, 4112, 4124, 5140, 5155, 8248, 10280, 10310, 16496, 20560, 20620, 41240, 82480, 264967, 529934, 1059868, 1324835, 2119736, 2649670, 4239472, 5299340, 10598680, 21197360]

約数ペア:

[(1, 21197360), (2, 10598680), (4, 5299340), (5, 4239472), (8, 2649670), (10, 2119736), (16, 1324835), (20, 1059868), (40, 529934), (80, 264967), (257, 82480), (514, 41240), (1028, 20620), (1031, 20560), (1285, 16496), (2056, 10310), (2062, 10280), (2570, 8248), (4112, 5155), (4124, 5140)]