19991240

素因数分解:

$2^3\times 5^1\times {\mathrm{499781}}^1$

素因数の和:499792

約数の個数: 16

約数和(自身を含む): 44980380

約数和(自身を除く): 24989140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499781, 999562, 1999124, 2498905, 3998248, 4997810, 9995620, 19991240]

約数ペア:

[(1, 19991240), (2, 9995620), (4, 4997810), (5, 3998248), (8, 2498905), (10, 1999124), (20, 999562), (40, 499781)]