389906420

素因数分解:

$2^2\times 5^1\times {\mathrm{19495321}}^1$

素因数の和:19495330

約数の個数: 12

約数和(自身を含む): 818803524

約数和(自身を除く): 428897104

約数列:

[1, 2, 4, 5, 10, 20, 19495321, 38990642, 77981284, 97476605, 194953210, 389906420]

約数ペア:

[(1, 389906420), (2, 194953210), (4, 97476605), (5, 77981284), (10, 38990642), (20, 19495321)]