21978375

素因数分解:

$3^1\times 5^3\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1$

素因数の和:137

約数の個数: 64

約数和(自身を含む): 39536640

約数和(自身を除く): 17558265

約数列:

[1, 3, 5, 15, 25, 29, 43, 47, 75, 87, 125, 129, 141, 145, 215, 235, 375, 435, 645, 705, 725, 1075, 1175, 1247, 1363, 2021, 2175, 3225, 3525, 3625, 3741, 4089, 5375, 5875, 6063, 6235, 6815, 10105, 10875, 16125, 17625, 18705, 20445, 30315, 31175, 34075, 50525, 58609, 93525, 102225, 151575, 155875, 170375, 175827, 252625, 293045, 467625, 511125, 757875, 879135, 1465225, 4395675, 7326125, 21978375]

約数ペア:

[(1, 21978375), (3, 7326125), (5, 4395675), (15, 1465225), (25, 879135), (29, 757875), (43, 511125), (47, 467625), (75, 293045), (87, 252625), (125, 175827), (129, 170375), (141, 155875), (145, 151575), (215, 102225), (235, 93525), (375, 58609), (435, 50525), (645, 34075), (705, 31175), (725, 30315), (1075, 20445), (1175, 18705), (1247, 17625), (1363, 16125), (2021, 10875), (2175, 10105), (3225, 6815), (3525, 6235), (3625, 6063), (3741, 5875), (4089, 5375)]