21185720

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{191}}^1$

素因数の和:308

約数の個数: 64

約数和(自身を含む): 49766400

約数和(自身を除く): 28580680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 59, 94, 118, 188, 191, 235, 236, 295, 376, 382, 470, 472, 590, 764, 940, 955, 1180, 1528, 1880, 1910, 2360, 2773, 3820, 5546, 7640, 8977, 11092, 11269, 13865, 17954, 22184, 22538, 27730, 35908, 44885, 45076, 55460, 56345, 71816, 89770, 90152, 110920, 112690, 179540, 225380, 359080, 450760, 529643, 1059286, 2118572, 2648215, 4237144, 5296430, 10592860, 21185720]

約数ペア:

[(1, 21185720), (2, 10592860), (4, 5296430), (5, 4237144), (8, 2648215), (10, 2118572), (20, 1059286), (40, 529643), (47, 450760), (59, 359080), (94, 225380), (118, 179540), (188, 112690), (191, 110920), (235, 90152), (236, 89770), (295, 71816), (376, 56345), (382, 55460), (470, 45076), (472, 44885), (590, 35908), (764, 27730), (940, 22538), (955, 22184), (1180, 17954), (1528, 13865), (1880, 11269), (1910, 11092), (2360, 8977), (2773, 7640), (3820, 5546)]