2780360

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:182

約数の個数: 64

約数和(自身を含む): 6998400

約数和(自身を除く): 4218040

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 71, 88, 89, 110, 142, 178, 220, 284, 355, 356, 440, 445, 568, 710, 712, 781, 890, 979, 1420, 1562, 1780, 1958, 2840, 3124, 3560, 3905, 3916, 4895, 6248, 6319, 7810, 7832, 9790, 12638, 15620, 19580, 25276, 31240, 31595, 39160, 50552, 63190, 69509, 126380, 139018, 252760, 278036, 347545, 556072, 695090, 1390180, 2780360]

約数ペア:

[(1, 2780360), (2, 1390180), (4, 695090), (5, 556072), (8, 347545), (10, 278036), (11, 252760), (20, 139018), (22, 126380), (40, 69509), (44, 63190), (55, 50552), (71, 39160), (88, 31595), (89, 31240), (110, 25276), (142, 19580), (178, 15620), (220, 12638), (284, 9790), (355, 7832), (356, 7810), (440, 6319), (445, 6248), (568, 4895), (710, 3916), (712, 3905), (781, 3560), (890, 3124), (979, 2840), (1420, 1958), (1562, 1780)]