81728080

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20849}}^1$

素因数の和:20876

約数の個数: 60

約数和(自身を含む): 221051700

約数和(自身を除く): 139323620

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20849, 41698, 83396, 104245, 145943, 166792, 208490, 291886, 333584, 416980, 583772, 729715, 833960, 1021601, 1167544, 1459430, 1667920, 2043202, 2335088, 2918860, 4086404, 5108005, 5837720, 8172808, 10216010, 11675440, 16345616, 20432020, 40864040, 81728080]

約数ペア:

[(1, 81728080), (2, 40864040), (4, 20432020), (5, 16345616), (7, 11675440), (8, 10216010), (10, 8172808), (14, 5837720), (16, 5108005), (20, 4086404), (28, 2918860), (35, 2335088), (40, 2043202), (49, 1667920), (56, 1459430), (70, 1167544), (80, 1021601), (98, 833960), (112, 729715), (140, 583772), (196, 416980), (245, 333584), (280, 291886), (392, 208490), (490, 166792), (560, 145943), (784, 104245), (980, 83396), (1960, 41698), (3920, 20849)]