21120057

素因数分解:

$3^2\times 7^1\times {\mathrm{137}}^1\times {\mathrm{2447}}^1$

素因数の和:2597

約数の個数: 24

約数和(自身を含む): 35133696

約数和(自身を除く): 14013639

約数列:

[1, 3, 7, 9, 21, 63, 137, 411, 959, 1233, 2447, 2877, 7341, 8631, 17129, 22023, 51387, 154161, 335239, 1005717, 2346673, 3017151, 7040019, 21120057]

約数ペア:

[(1, 21120057), (3, 7040019), (7, 3017151), (9, 2346673), (21, 1005717), (63, 335239), (137, 154161), (411, 51387), (959, 22023), (1233, 17129), (2447, 8631), (2877, 7341)]