21126280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{383}}^1$

素因数の和:598

約数の個数: 64

約数和(自身を含む): 54743040

約数和(自身を除く): 33616760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 197, 280, 383, 394, 766, 788, 985, 1379, 1532, 1576, 1915, 1970, 2681, 2758, 3064, 3830, 3940, 5362, 5516, 6895, 7660, 7880, 10724, 11032, 13405, 13790, 15320, 21448, 26810, 27580, 53620, 55160, 75451, 107240, 150902, 301804, 377255, 528157, 603608, 754510, 1056314, 1509020, 2112628, 2640785, 3018040, 4225256, 5281570, 10563140, 21126280]

約数ペア:

[(1, 21126280), (2, 10563140), (4, 5281570), (5, 4225256), (7, 3018040), (8, 2640785), (10, 2112628), (14, 1509020), (20, 1056314), (28, 754510), (35, 603608), (40, 528157), (56, 377255), (70, 301804), (140, 150902), (197, 107240), (280, 75451), (383, 55160), (394, 53620), (766, 27580), (788, 26810), (985, 21448), (1379, 15320), (1532, 13790), (1576, 13405), (1915, 11032), (1970, 10724), (2681, 7880), (2758, 7660), (3064, 6895), (3830, 5516), (3940, 5362)]