20498905

素因数分解:

$5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{2699}}^1$

素因数の和:2749

約数の個数: 24

約数和(自身を含む): 29548800

約数和(自身を除く): 9049895

約数列:

[1, 5, 7, 31, 35, 49, 155, 217, 245, 1085, 1519, 2699, 7595, 13495, 18893, 83669, 94465, 132251, 418345, 585683, 661255, 2928415, 4099781, 20498905]

約数ペア:

[(1, 20498905), (5, 4099781), (7, 2928415), (31, 661255), (35, 585683), (49, 418345), (155, 132251), (217, 94465), (245, 83669), (1085, 18893), (1519, 13495), (2699, 7595)]