21405069

素因数分解:

$3^2\times 7^1\times {\mathrm{47}}^1\times {\mathrm{7229}}^1$

素因数の和:7289

約数の個数: 24

約数和(自身を含む): 36092160

約数和(自身を除く): 14687091

約数列:

[1, 3, 7, 9, 21, 47, 63, 141, 329, 423, 987, 2961, 7229, 21687, 50603, 65061, 151809, 339763, 455427, 1019289, 2378341, 3057867, 7135023, 21405069]

約数ペア:

[(1, 21405069), (3, 7135023), (7, 3057867), (9, 2378341), (21, 1019289), (47, 455427), (63, 339763), (141, 151809), (329, 65061), (423, 50603), (987, 21687), (2961, 7229)]