19975865

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1021}}^1$

素因数の和:1089

約数の個数: 32

約数和(自身を含む): 30218496

約数和(自身を除く): 10242631

約数列:

[1, 5, 7, 13, 35, 43, 65, 91, 215, 301, 455, 559, 1021, 1505, 2795, 3913, 5105, 7147, 13273, 19565, 35735, 43903, 66365, 92911, 219515, 307321, 464555, 570739, 1536605, 2853695, 3995173, 19975865]

約数ペア:

[(1, 19975865), (5, 3995173), (7, 2853695), (13, 1536605), (35, 570739), (43, 464555), (65, 307321), (91, 219515), (215, 92911), (301, 66365), (455, 43903), (559, 35735), (1021, 19565), (1505, 13273), (2795, 7147), (3913, 5105)]