20808905

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{449}}^1$

素因数の和:521

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 8221495

約数列:

[1, 5, 13, 23, 31, 65, 115, 155, 299, 403, 449, 713, 1495, 2015, 2245, 3565, 5837, 9269, 10327, 13919, 29185, 46345, 51635, 69595, 134251, 180947, 320137, 671255, 904735, 1600685, 4161781, 20808905]

約数ペア:

[(1, 20808905), (5, 4161781), (13, 1600685), (23, 904735), (31, 671255), (65, 320137), (115, 180947), (155, 134251), (299, 69595), (403, 51635), (449, 46345), (713, 29185), (1495, 13919), (2015, 10327), (2245, 9269), (3565, 5837)]