20686589

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{137}}^1$

素因数の和:245

約数の個数: 32

約数和(自身を含む): 27184896

約数和(自身を除く): 6498307

約数列:

[1, 7, 11, 37, 53, 77, 137, 259, 371, 407, 583, 959, 1507, 1961, 2849, 4081, 5069, 7261, 10549, 13727, 21571, 35483, 50827, 55759, 79871, 150997, 268657, 390313, 559097, 1880599, 2955227, 20686589]

約数ペア:

[(1, 20686589), (7, 2955227), (11, 1880599), (37, 559097), (53, 390313), (77, 268657), (137, 150997), (259, 79871), (371, 55759), (407, 50827), (583, 35483), (959, 21571), (1507, 13727), (1961, 10549), (2849, 7261), (4081, 5069)]