21371805

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{307}}^1$

素因数の和:355

約数の個数: 96

約数和(自身を含む): 48432384

約数和(自身を除く): 27060579

約数列:

[1, 3, 5, 7, 9, 13, 15, 17, 21, 35, 39, 45, 51, 63, 65, 85, 91, 105, 117, 119, 153, 195, 221, 255, 273, 307, 315, 357, 455, 585, 595, 663, 765, 819, 921, 1071, 1105, 1365, 1535, 1547, 1785, 1989, 2149, 2763, 3315, 3991, 4095, 4605, 4641, 5219, 5355, 6447, 7735, 9945, 10745, 11973, 13815, 13923, 15657, 19341, 19955, 23205, 26095, 27937, 32235, 35919, 36533, 46971, 59865, 67847, 69615, 78285, 83811, 96705, 109599, 139685, 179595, 182665, 203541, 234855, 251433, 328797, 339235, 419055, 474929, 547995, 610623, 1017705, 1257165, 1424787, 1643985, 2374645, 3053115, 4274361, 7123935, 21371805]

約数ペア:

[(1, 21371805), (3, 7123935), (5, 4274361), (7, 3053115), (9, 2374645), (13, 1643985), (15, 1424787), (17, 1257165), (21, 1017705), (35, 610623), (39, 547995), (45, 474929), (51, 419055), (63, 339235), (65, 328797), (85, 251433), (91, 234855), (105, 203541), (117, 182665), (119, 179595), (153, 139685), (195, 109599), (221, 96705), (255, 83811), (273, 78285), (307, 69615), (315, 67847), (357, 59865), (455, 46971), (585, 36533), (595, 35919), (663, 32235), (765, 27937), (819, 26095), (921, 23205), (1071, 19955), (1105, 19341), (1365, 15657), (1535, 13923), (1547, 13815), (1785, 11973), (1989, 10745), (2149, 9945), (2763, 7735), (3315, 6447), (3991, 5355), (4095, 5219), (4605, 4641)]