21390525

素因数分解:

$3^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{103}}^1$

素因数の和:203

約数の個数: 72

約数和(自身を含む): 42247296

約数和(自身を除く): 20856771

約数列:

[1, 3, 5, 9, 13, 15, 25, 39, 45, 65, 71, 75, 103, 117, 195, 213, 225, 309, 325, 355, 515, 585, 639, 923, 927, 975, 1065, 1339, 1545, 1775, 2575, 2769, 2925, 3195, 4017, 4615, 4635, 5325, 6695, 7313, 7725, 8307, 12051, 13845, 15975, 20085, 21939, 23075, 23175, 33475, 36565, 41535, 60255, 65817, 69225, 95069, 100425, 109695, 182825, 207675, 285207, 301275, 329085, 475345, 548475, 855621, 1426035, 1645425, 2376725, 4278105, 7130175, 21390525]

約数ペア:

[(1, 21390525), (3, 7130175), (5, 4278105), (9, 2376725), (13, 1645425), (15, 1426035), (25, 855621), (39, 548475), (45, 475345), (65, 329085), (71, 301275), (75, 285207), (103, 207675), (117, 182825), (195, 109695), (213, 100425), (225, 95069), (309, 69225), (325, 65817), (355, 60255), (515, 41535), (585, 36565), (639, 33475), (923, 23175), (927, 23075), (975, 21939), (1065, 20085), (1339, 15975), (1545, 13845), (1775, 12051), (2575, 8307), (2769, 7725), (2925, 7313), (3195, 6695), (4017, 5325), (4615, 4635)]