28657720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{7873}}^1$

素因数の和:7904

約数の個数: 64

約数和(自身を含む): 79369920

約数和(自身を除く): 50712200

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 26, 28, 35, 40, 52, 56, 65, 70, 91, 104, 130, 140, 182, 260, 280, 364, 455, 520, 728, 910, 1820, 3640, 7873, 15746, 31492, 39365, 55111, 62984, 78730, 102349, 110222, 157460, 204698, 220444, 275555, 314920, 409396, 440888, 511745, 551110, 716443, 818792, 1023490, 1102220, 1432886, 2046980, 2204440, 2865772, 3582215, 4093960, 5731544, 7164430, 14328860, 28657720]

約数ペア:

[(1, 28657720), (2, 14328860), (4, 7164430), (5, 5731544), (7, 4093960), (8, 3582215), (10, 2865772), (13, 2204440), (14, 2046980), (20, 1432886), (26, 1102220), (28, 1023490), (35, 818792), (40, 716443), (52, 551110), (56, 511745), (65, 440888), (70, 409396), (91, 314920), (104, 275555), (130, 220444), (140, 204698), (182, 157460), (260, 110222), (280, 102349), (364, 78730), (455, 62984), (520, 55111), (728, 39365), (910, 31492), (1820, 15746), (3640, 7873)]