21220305

素因数分解:

$3^1\times 5^1\times {\mathrm{641}}^1\times {\mathrm{2207}}^1$

素因数の和:2856

約数の個数: 16

約数和(自身を含む): 34020864

約数和(自身を除く): 12800559

約数列:

[1, 3, 5, 15, 641, 1923, 2207, 3205, 6621, 9615, 11035, 33105, 1414687, 4244061, 7073435, 21220305]

約数ペア:

[(1, 21220305), (3, 7073435), (5, 4244061), (15, 1414687), (641, 33105), (1923, 11035), (2207, 9615), (3205, 6621)]