81391660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{581369}}^1$

素因数の和:581385

約数の個数: 24

約数和(自身を含む): 195340320

約数和(自身を除く): 113948660

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 581369, 1162738, 2325476, 2906845, 4069583, 5813690, 8139166, 11627380, 16278332, 20347915, 40695830, 81391660]

約数ペア:

[(1, 81391660), (2, 40695830), (4, 20347915), (5, 16278332), (7, 11627380), (10, 8139166), (14, 5813690), (20, 4069583), (28, 2906845), (35, 2325476), (70, 1162738), (140, 581369)]