20721842

素因数分解:

$2^1\times {\mathrm{131}}^1\times {\mathrm{139}}^1\times {\mathrm{569}}^1$

素因数の和:841

約数の個数: 16

約数和(自身を含む): 31600800

約数和(自身を除く): 10878958

約数列:

[1, 2, 131, 139, 262, 278, 569, 1138, 18209, 36418, 74539, 79091, 149078, 158182, 10360921, 20721842]

約数ペア:

[(1, 20721842), (2, 10360921), (131, 158182), (139, 149078), (262, 79091), (278, 74539), (569, 36418), (1138, 18209)]