20865515

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{487}}^1$

素因数の和:563

約数の個数: 32

約数和(自身を含む): 29514240

約数和(自身を除く): 8648725

約数列:

[1, 5, 11, 19, 41, 55, 95, 205, 209, 451, 487, 779, 1045, 2255, 2435, 3895, 5357, 8569, 9253, 19967, 26785, 42845, 46265, 99835, 101783, 219637, 379373, 508915, 1098185, 1896865, 4173103, 20865515]

約数ペア:

[(1, 20865515), (5, 4173103), (11, 1896865), (19, 1098185), (41, 508915), (55, 379373), (95, 219637), (205, 101783), (209, 99835), (451, 46265), (487, 42845), (779, 26785), (1045, 19967), (2255, 9253), (2435, 8569), (3895, 5357)]