21281253

素因数分解:

$3^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{449}}^1$

素因数の和:557

約数の個数: 32

約数和(自身を含む): 33926400

約数和(自身を除く): 12645147

約数列:

[1, 3, 7, 21, 37, 61, 111, 183, 259, 427, 449, 777, 1281, 1347, 2257, 3143, 6771, 9429, 15799, 16613, 27389, 47397, 49839, 82167, 116291, 191723, 348873, 575169, 1013393, 3040179, 7093751, 21281253]

約数ペア:

[(1, 21281253), (3, 7093751), (7, 3040179), (21, 1013393), (37, 575169), (61, 348873), (111, 191723), (183, 116291), (259, 82167), (427, 49839), (449, 47397), (777, 27389), (1281, 16613), (1347, 15799), (2257, 9429), (3143, 6771)]