21284289

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1$

素因数の和:112

約数の個数: 80

約数和(自身を含む): 38419920

約数和(自身を除く): 17135631

約数列:

[1, 3, 9, 13, 17, 27, 29, 39, 41, 51, 81, 87, 117, 123, 153, 221, 261, 351, 369, 377, 459, 493, 533, 663, 697, 783, 1053, 1107, 1131, 1189, 1377, 1479, 1599, 1989, 2091, 2349, 3321, 3393, 3567, 4437, 4797, 5967, 6273, 6409, 9061, 10179, 10701, 13311, 14391, 15457, 17901, 18819, 19227, 20213, 27183, 30537, 32103, 39933, 43173, 46371, 56457, 57681, 60639, 81549, 96309, 139113, 173043, 181917, 244647, 262769, 417339, 519129, 545751, 733941, 788307, 1252017, 1637253, 2364921, 7094763, 21284289]

約数ペア:

[(1, 21284289), (3, 7094763), (9, 2364921), (13, 1637253), (17, 1252017), (27, 788307), (29, 733941), (39, 545751), (41, 519129), (51, 417339), (81, 262769), (87, 244647), (117, 181917), (123, 173043), (153, 139113), (221, 96309), (261, 81549), (351, 60639), (369, 57681), (377, 56457), (459, 46371), (493, 43173), (533, 39933), (663, 32103), (697, 30537), (783, 27183), (1053, 20213), (1107, 19227), (1131, 18819), (1189, 17901), (1377, 15457), (1479, 14391), (1599, 13311), (1989, 10701), (2091, 10179), (2349, 9061), (3321, 6409), (3393, 6273), (3567, 5967), (4437, 4797)]