21005761

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{151}}^1\times {\mathrm{167}}^1$

素因数の和:349

約数の個数: 24

約数和(自身を含む): 26199936

約数和(自身を除く): 5194175

約数列:

[1, 7, 17, 49, 119, 151, 167, 833, 1057, 1169, 2567, 2839, 7399, 8183, 17969, 19873, 25217, 125783, 139111, 176519, 428689, 1235633, 3000823, 21005761]

約数ペア:

[(1, 21005761), (7, 3000823), (17, 1235633), (49, 428689), (119, 176519), (151, 139111), (167, 125783), (833, 25217), (1057, 19873), (1169, 17969), (2567, 8183), (2839, 7399)]