16685720

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:252

約数の個数: 64

約数和(自身を含む): 39204000

約数和(自身を除く): 22518280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 89, 109, 172, 178, 215, 218, 344, 356, 430, 436, 445, 545, 712, 860, 872, 890, 1090, 1720, 1780, 2180, 3560, 3827, 4360, 4687, 7654, 9374, 9701, 15308, 18748, 19135, 19402, 23435, 30616, 37496, 38270, 38804, 46870, 48505, 76540, 77608, 93740, 97010, 153080, 187480, 194020, 388040, 417143, 834286, 1668572, 2085715, 3337144, 4171430, 8342860, 16685720]

約数ペア:

[(1, 16685720), (2, 8342860), (4, 4171430), (5, 3337144), (8, 2085715), (10, 1668572), (20, 834286), (40, 417143), (43, 388040), (86, 194020), (89, 187480), (109, 153080), (172, 97010), (178, 93740), (215, 77608), (218, 76540), (344, 48505), (356, 46870), (430, 38804), (436, 38270), (445, 37496), (545, 30616), (712, 23435), (860, 19402), (872, 19135), (890, 18748), (1090, 15308), (1720, 9701), (1780, 9374), (2180, 7654), (3560, 4687), (3827, 4360)]