21069868

素因数分解:

$2^2\times {\mathrm{17}}^1\times {\mathrm{309851}}^1$

素因数の和:309872

約数の個数: 12

約数和(自身を含む): 39041352

約数和(自身を除く): 17971484

約数列:

[1, 2, 4, 17, 34, 68, 309851, 619702, 1239404, 5267467, 10534934, 21069868]

約数ペア:

[(1, 21069868), (2, 10534934), (4, 5267467), (17, 1239404), (34, 619702), (68, 309851)]