21871305

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{127}}^1$

素因数の和:270

約数の個数: 48

約数和(自身を含む): 39536640

約数和(自身を除く): 17665335

約数列:

[1, 3, 5, 9, 15, 43, 45, 89, 127, 129, 215, 267, 381, 387, 445, 635, 645, 801, 1143, 1335, 1905, 1935, 3827, 4005, 5461, 5715, 11303, 11481, 16383, 19135, 27305, 33909, 34443, 49149, 56515, 57405, 81915, 101727, 169545, 172215, 245745, 486029, 508635, 1458087, 2430145, 4374261, 7290435, 21871305]

約数ペア:

[(1, 21871305), (3, 7290435), (5, 4374261), (9, 2430145), (15, 1458087), (43, 508635), (45, 486029), (89, 245745), (127, 172215), (129, 169545), (215, 101727), (267, 81915), (381, 57405), (387, 56515), (445, 49149), (635, 34443), (645, 33909), (801, 27305), (1143, 19135), (1335, 16383), (1905, 11481), (1935, 11303), (3827, 5715), (4005, 5461)]