21240115

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{127}}^1$

素因数の和:259

約数の個数: 32

約数和(自身を含む): 28901376

約数和(自身を除く): 7661261

約数列:

[1, 5, 13, 31, 65, 83, 127, 155, 403, 415, 635, 1079, 1651, 2015, 2573, 3937, 5395, 8255, 10541, 12865, 19685, 33449, 51181, 52705, 137033, 167245, 255905, 326771, 685165, 1633855, 4248023, 21240115]

約数ペア:

[(1, 21240115), (5, 4248023), (13, 1633855), (31, 685165), (65, 326771), (83, 255905), (127, 167245), (155, 137033), (403, 52705), (415, 51181), (635, 33449), (1079, 19685), (1651, 12865), (2015, 10541), (2573, 8255), (3937, 5395)]