21815781

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{499}}^1$

素因数の和:593

約数の個数: 32

約数和(自身を含む): 33600000

約数和(自身を除く): 11784219

約数列:

[1, 3, 13, 19, 39, 57, 59, 177, 247, 499, 741, 767, 1121, 1497, 2301, 3363, 6487, 9481, 14573, 19461, 28443, 29441, 43719, 88323, 123253, 369759, 382733, 559379, 1148199, 1678137, 7271927, 21815781]

約数ペア:

[(1, 21815781), (3, 7271927), (13, 1678137), (19, 1148199), (39, 559379), (57, 382733), (59, 369759), (177, 123253), (247, 88323), (499, 43719), (741, 29441), (767, 28443), (1121, 19461), (1497, 14573), (2301, 9481), (3363, 6487)]