21123680

素因数分解:

$2^5\times 5^1\times {\mathrm{47}}^1\times {\mathrm{53}}^2$

素因数の和:168

約数の個数: 72

約数和(自身を含む): 51946272

約数和(自身を除く): 30822592

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 47, 53, 80, 94, 106, 160, 188, 212, 235, 265, 376, 424, 470, 530, 752, 848, 940, 1060, 1504, 1696, 1880, 2120, 2491, 2809, 3760, 4240, 4982, 5618, 7520, 8480, 9964, 11236, 12455, 14045, 19928, 22472, 24910, 28090, 39856, 44944, 49820, 56180, 79712, 89888, 99640, 112360, 132023, 199280, 224720, 264046, 398560, 449440, 528092, 660115, 1056184, 1320230, 2112368, 2640460, 4224736, 5280920, 10561840, 21123680]

約数ペア:

[(1, 21123680), (2, 10561840), (4, 5280920), (5, 4224736), (8, 2640460), (10, 2112368), (16, 1320230), (20, 1056184), (32, 660115), (40, 528092), (47, 449440), (53, 398560), (80, 264046), (94, 224720), (106, 199280), (160, 132023), (188, 112360), (212, 99640), (235, 89888), (265, 79712), (376, 56180), (424, 49820), (470, 44944), (530, 39856), (752, 28090), (848, 24910), (940, 22472), (1060, 19928), (1504, 14045), (1696, 12455), (1880, 11236), (2120, 9964), (2491, 8480), (2809, 7520), (3760, 5618), (4240, 4982)]