20878767

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{37}}^1\times {\mathrm{53}}^1$

素因数の和:129

約数の個数: 72

約数和(自身を含む): 39053664

約数和(自身を除く): 18174897

約数列:

[1, 3, 7, 9, 13, 21, 37, 39, 53, 63, 91, 111, 117, 159, 169, 259, 273, 333, 371, 477, 481, 507, 689, 777, 819, 1113, 1183, 1443, 1521, 1961, 2067, 2331, 3339, 3367, 3549, 4329, 4823, 5883, 6201, 6253, 8957, 10101, 10647, 13727, 14469, 17649, 18759, 25493, 26871, 30303, 41181, 43407, 43771, 56277, 62699, 76479, 80613, 123543, 131313, 178451, 188097, 229437, 331409, 393939, 535353, 564291, 994227, 1606059, 2319863, 2982681, 6959589, 20878767]

約数ペア:

[(1, 20878767), (3, 6959589), (7, 2982681), (9, 2319863), (13, 1606059), (21, 994227), (37, 564291), (39, 535353), (53, 393939), (63, 331409), (91, 229437), (111, 188097), (117, 178451), (159, 131313), (169, 123543), (259, 80613), (273, 76479), (333, 62699), (371, 56277), (477, 43771), (481, 43407), (507, 41181), (689, 30303), (777, 26871), (819, 25493), (1113, 18759), (1183, 17649), (1443, 14469), (1521, 13727), (1961, 10647), (2067, 10101), (2331, 8957), (3339, 6253), (3367, 6201), (3549, 5883), (4329, 4823)]