19988311

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{67}}^1\times {\mathrm{109}}^1$

素因数の和:223

約数の個数: 32

約数和(自身を含む): 25850880

約数和(自身を除く): 5862569

約数列:

[1, 7, 17, 23, 67, 109, 119, 161, 391, 469, 763, 1139, 1541, 1853, 2507, 2737, 7303, 7973, 10787, 12971, 17549, 26197, 42619, 51121, 124151, 167969, 183379, 298333, 869057, 1175783, 2855473, 19988311]

約数ペア:

[(1, 19988311), (7, 2855473), (17, 1175783), (23, 869057), (67, 298333), (109, 183379), (119, 167969), (161, 124151), (391, 51121), (469, 42619), (763, 26197), (1139, 17549), (1541, 12971), (1853, 10787), (2507, 7973), (2737, 7303)]