21456890

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1$

素因数の和:136

約数の個数: 128

約数和(自身を含む): 53706240

約数和(自身を除く): 32249350

約数列:

[1, 2, 5, 7, 10, 13, 14, 17, 19, 26, 34, 35, 38, 65, 70, 73, 85, 91, 95, 119, 130, 133, 146, 170, 182, 190, 221, 238, 247, 266, 323, 365, 442, 455, 494, 511, 595, 646, 665, 730, 910, 949, 1022, 1105, 1190, 1235, 1241, 1330, 1387, 1547, 1615, 1729, 1898, 2210, 2261, 2470, 2482, 2555, 2774, 3094, 3230, 3458, 4199, 4522, 4745, 5110, 6205, 6643, 6935, 7735, 8398, 8645, 8687, 9490, 9709, 11305, 12410, 13286, 13870, 15470, 16133, 17290, 17374, 18031, 19418, 20995, 22610, 23579, 29393, 32266, 33215, 36062, 41990, 43435, 47158, 48545, 58786, 66430, 80665, 86870, 90155, 97090, 112931, 117895, 126217, 146965, 161330, 165053, 180310, 225862, 235790, 252434, 293930, 306527, 330106, 564655, 613054, 631085, 825265, 1129310, 1262170, 1532635, 1650530, 2145689, 3065270, 4291378, 10728445, 21456890]

約数ペア:

[(1, 21456890), (2, 10728445), (5, 4291378), (7, 3065270), (10, 2145689), (13, 1650530), (14, 1532635), (17, 1262170), (19, 1129310), (26, 825265), (34, 631085), (35, 613054), (38, 564655), (65, 330106), (70, 306527), (73, 293930), (85, 252434), (91, 235790), (95, 225862), (119, 180310), (130, 165053), (133, 161330), (146, 146965), (170, 126217), (182, 117895), (190, 112931), (221, 97090), (238, 90155), (247, 86870), (266, 80665), (323, 66430), (365, 58786), (442, 48545), (455, 47158), (494, 43435), (511, 41990), (595, 36062), (646, 33215), (665, 32266), (730, 29393), (910, 23579), (949, 22610), (1022, 20995), (1105, 19418), (1190, 18031), (1235, 17374), (1241, 17290), (1330, 16133), (1387, 15470), (1547, 13870), (1615, 13286), (1729, 12410), (1898, 11305), (2210, 9709), (2261, 9490), (2470, 8687), (2482, 8645), (2555, 8398), (2774, 7735), (3094, 6935), (3230, 6643), (3458, 6205), (4199, 5110), (4522, 4745)]