21646521

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{337}}^1$

素因数の和:423

約数の個数: 40

約数和(自身を含む): 35499464

約数和(自身を除く): 13852943

約数列:

[1, 3, 9, 13, 27, 39, 61, 81, 117, 183, 337, 351, 549, 793, 1011, 1053, 1647, 2379, 3033, 4381, 4941, 7137, 9099, 13143, 20557, 21411, 27297, 39429, 61671, 64233, 118287, 185013, 267241, 354861, 555039, 801723, 1665117, 2405169, 7215507, 21646521]

約数ペア:

[(1, 21646521), (3, 7215507), (9, 2405169), (13, 1665117), (27, 801723), (39, 555039), (61, 354861), (81, 267241), (117, 185013), (183, 118287), (337, 64233), (351, 61671), (549, 39429), (793, 27297), (1011, 21411), (1053, 20557), (1647, 13143), (2379, 9099), (3033, 7137), (4381, 4941)]