20130020

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{263}}^1$

素因数の和:404

約数の個数: 48

約数和(自身を含む): 43908480

約数和(自身を除く): 23778460

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 89, 172, 178, 215, 263, 356, 430, 445, 526, 860, 890, 1052, 1315, 1780, 2630, 3827, 5260, 7654, 11309, 15308, 19135, 22618, 23407, 38270, 45236, 46814, 56545, 76540, 93628, 113090, 117035, 226180, 234070, 468140, 1006501, 2013002, 4026004, 5032505, 10065010, 20130020]

約数ペア:

[(1, 20130020), (2, 10065010), (4, 5032505), (5, 4026004), (10, 2013002), (20, 1006501), (43, 468140), (86, 234070), (89, 226180), (172, 117035), (178, 113090), (215, 93628), (263, 76540), (356, 56545), (430, 46814), (445, 45236), (526, 38270), (860, 23407), (890, 22618), (1052, 19135), (1315, 15308), (1780, 11309), (2630, 7654), (3827, 5260)]