19818320

素因数分解:

$2^4\times 5^1\times {\mathrm{247729}}^1$

素因数の和:247742

約数の個数: 20

約数和(自身を含む): 46077780

約数和(自身を除く): 26259460

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247729, 495458, 990916, 1238645, 1981832, 2477290, 3963664, 4954580, 9909160, 19818320]

約数ペア:

[(1, 19818320), (2, 9909160), (4, 4954580), (5, 3963664), (8, 2477290), (10, 1981832), (16, 1238645), (20, 990916), (40, 495458), (80, 247729)]