20981009

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{1123}}^1$

素因数の和:1304

約数の個数: 16

約数和(自身を含む): 25573248

約数和(自身を除く): 4592239

約数列:

[1, 7, 17, 119, 157, 1099, 1123, 2669, 7861, 18683, 19091, 133637, 176311, 1234177, 2997287, 20981009]

約数ペア:

[(1, 20981009), (7, 2997287), (17, 1234177), (119, 176311), (157, 133637), (1099, 19091), (1123, 18683), (2669, 7861)]