21389589

素因数分解:

$3^6\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:129

約数の個数: 56

約数和(自身を含む): 36051512

約数和(自身を除く): 14661923

約数列:

[1, 3, 9, 13, 27, 37, 39, 61, 81, 111, 117, 183, 243, 333, 351, 481, 549, 729, 793, 999, 1053, 1443, 1647, 2257, 2379, 2997, 3159, 4329, 4941, 6771, 7137, 8991, 9477, 12987, 14823, 20313, 21411, 26973, 29341, 38961, 44469, 60939, 64233, 88023, 116883, 182817, 192699, 264069, 350649, 548451, 578097, 792207, 1645353, 2376621, 7129863, 21389589]

約数ペア:

[(1, 21389589), (3, 7129863), (9, 2376621), (13, 1645353), (27, 792207), (37, 578097), (39, 548451), (61, 350649), (81, 264069), (111, 192699), (117, 182817), (183, 116883), (243, 88023), (333, 64233), (351, 60939), (481, 44469), (549, 38961), (729, 29341), (793, 26973), (999, 21411), (1053, 20313), (1443, 14823), (1647, 12987), (2257, 9477), (2379, 8991), (2997, 7137), (3159, 6771), (4329, 4941)]