20817915

素因数分解:

$3^1\times 5^1\times {\mathrm{401}}^1\times {\mathrm{3461}}^1$

素因数の和:3870

約数の個数: 16

約数和(自身を含む): 33401376

約数和(自身を除く): 12583461

約数列:

[1, 3, 5, 15, 401, 1203, 2005, 3461, 6015, 10383, 17305, 51915, 1387861, 4163583, 6939305, 20817915]

約数ペア:

[(1, 20817915), (3, 6939305), (5, 4163583), (15, 1387861), (401, 51915), (1203, 17305), (2005, 10383), (3461, 6015)]