81287920

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{379}}^1\times {\mathrm{383}}^1$

素因数の和:782

約数の個数: 80

約数和(自身を含む): 217128960

約数和(自身を除く): 135841040

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 280, 379, 383, 560, 758, 766, 1516, 1532, 1895, 1915, 2653, 2681, 3032, 3064, 3790, 3830, 5306, 5362, 6064, 6128, 7580, 7660, 10612, 10724, 13265, 13405, 15160, 15320, 21224, 21448, 26530, 26810, 30320, 30640, 42448, 42896, 53060, 53620, 106120, 107240, 145157, 212240, 214480, 290314, 580628, 725785, 1016099, 1161256, 1451570, 2032198, 2322512, 2903140, 4064396, 5080495, 5806280, 8128792, 10160990, 11612560, 16257584, 20321980, 40643960, 81287920]

約数ペア:

[(1, 81287920), (2, 40643960), (4, 20321980), (5, 16257584), (7, 11612560), (8, 10160990), (10, 8128792), (14, 5806280), (16, 5080495), (20, 4064396), (28, 2903140), (35, 2322512), (40, 2032198), (56, 1451570), (70, 1161256), (80, 1016099), (112, 725785), (140, 580628), (280, 290314), (379, 214480), (383, 212240), (560, 145157), (758, 107240), (766, 106120), (1516, 53620), (1532, 53060), (1895, 42896), (1915, 42448), (2653, 30640), (2681, 30320), (3032, 26810), (3064, 26530), (3790, 21448), (3830, 21224), (5306, 15320), (5362, 15160), (6064, 13405), (6128, 13265), (7580, 10724), (7660, 10612)]