20409790

素因数分解:

$2^1\times 5^1\times {\mathrm{1021}}^1\times {\mathrm{1999}}^1$

素因数の和:3027

約数の個数: 16

約数和(自身を含む): 36792000

約数和(自身を除く): 16382210

約数列:

[1, 2, 5, 10, 1021, 1999, 2042, 3998, 5105, 9995, 10210, 19990, 2040979, 4081958, 10204895, 20409790]

約数ペア:

[(1, 20409790), (2, 10204895), (5, 4081958), (10, 2040979), (1021, 19990), (1999, 10210), (2042, 9995), (3998, 5105)]