21071925

素因数分解:

$3^2\times 5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{787}}^1$

素因数の和:827

約数の個数: 72

約数和(自身を含む): 45729216

約数和(自身を除く): 24657291

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 25, 35, 45, 51, 63, 75, 85, 105, 119, 153, 175, 225, 255, 315, 357, 425, 525, 595, 765, 787, 1071, 1275, 1575, 1785, 2361, 2975, 3825, 3935, 5355, 5509, 7083, 8925, 11805, 13379, 16527, 19675, 26775, 27545, 35415, 40137, 49581, 59025, 66895, 82635, 93653, 120411, 137725, 177075, 200685, 247905, 280959, 334475, 413175, 468265, 602055, 842877, 1003425, 1239525, 1404795, 2341325, 3010275, 4214385, 7023975, 21071925]

約数ペア:

[(1, 21071925), (3, 7023975), (5, 4214385), (7, 3010275), (9, 2341325), (15, 1404795), (17, 1239525), (21, 1003425), (25, 842877), (35, 602055), (45, 468265), (51, 413175), (63, 334475), (75, 280959), (85, 247905), (105, 200685), (119, 177075), (153, 137725), (175, 120411), (225, 93653), (255, 82635), (315, 66895), (357, 59025), (425, 49581), (525, 40137), (595, 35415), (765, 27545), (787, 26775), (1071, 19675), (1275, 16527), (1575, 13379), (1785, 11805), (2361, 8925), (2975, 7083), (3825, 5509), (3935, 5355)]