21138975

素因数分解:

$3^4\times 5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1$

素因数の和:119

約数の個数: 120

約数和(自身を含む): 46632432

約数和(自身を除く): 25493457

約数列:

[1, 3, 5, 9, 11, 13, 15, 25, 27, 33, 39, 45, 55, 65, 73, 75, 81, 99, 117, 135, 143, 165, 195, 219, 225, 275, 297, 325, 351, 365, 405, 429, 495, 585, 657, 675, 715, 803, 825, 891, 949, 975, 1053, 1095, 1287, 1485, 1755, 1825, 1971, 2025, 2145, 2409, 2475, 2847, 2925, 3285, 3575, 3861, 4015, 4455, 4745, 5265, 5475, 5913, 6435, 7227, 7425, 8541, 8775, 9855, 10439, 10725, 11583, 12045, 14235, 16425, 19305, 20075, 21681, 22275, 23725, 25623, 26325, 29565, 31317, 32175, 36135, 42705, 49275, 52195, 57915, 60225, 65043, 71175, 76869, 93951, 96525, 108405, 128115, 147825, 156585, 180675, 213525, 260975, 281853, 289575, 325215, 384345, 469755, 542025, 640575, 782925, 845559, 1409265, 1626075, 1921725, 2348775, 4227795, 7046325, 21138975]

約数ペア:

[(1, 21138975), (3, 7046325), (5, 4227795), (9, 2348775), (11, 1921725), (13, 1626075), (15, 1409265), (25, 845559), (27, 782925), (33, 640575), (39, 542025), (45, 469755), (55, 384345), (65, 325215), (73, 289575), (75, 281853), (81, 260975), (99, 213525), (117, 180675), (135, 156585), (143, 147825), (165, 128115), (195, 108405), (219, 96525), (225, 93951), (275, 76869), (297, 71175), (325, 65043), (351, 60225), (365, 57915), (405, 52195), (429, 49275), (495, 42705), (585, 36135), (657, 32175), (675, 31317), (715, 29565), (803, 26325), (825, 25623), (891, 23725), (949, 22275), (975, 21681), (1053, 20075), (1095, 19305), (1287, 16425), (1485, 14235), (1755, 12045), (1825, 11583), (1971, 10725), (2025, 10439), (2145, 9855), (2409, 8775), (2475, 8541), (2847, 7425), (2925, 7227), (3285, 6435), (3575, 5913), (3861, 5475), (4015, 5265), (4455, 4745)]