19997494

素因数分解:

$2^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{21139}}^1$

素因数の和:21195

約数の個数: 16

約数和(自身を含む): 33485760

約数和(自身を除く): 13488266

約数列:

[1, 2, 11, 22, 43, 86, 473, 946, 21139, 42278, 232529, 465058, 908977, 1817954, 9998747, 19997494]

約数ペア:

[(1, 19997494), (2, 9998747), (11, 1817954), (22, 908977), (43, 465058), (86, 232529), (473, 42278), (946, 21139)]