19888016

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{137}}^1\times {\mathrm{211}}^1$

素因数の和:399

約数の個数: 40

約数和(自身を含む): 39905184

約数和(自身を除く): 20017168

約数列:

[1, 2, 4, 8, 16, 43, 86, 137, 172, 211, 274, 344, 422, 548, 688, 844, 1096, 1688, 2192, 3376, 5891, 9073, 11782, 18146, 23564, 28907, 36292, 47128, 57814, 72584, 94256, 115628, 145168, 231256, 462512, 1243001, 2486002, 4972004, 9944008, 19888016]

約数ペア:

[(1, 19888016), (2, 9944008), (4, 4972004), (8, 2486002), (16, 1243001), (43, 462512), (86, 231256), (137, 145168), (172, 115628), (211, 94256), (274, 72584), (344, 57814), (422, 47128), (548, 36292), (688, 28907), (844, 23564), (1096, 18146), (1688, 11782), (2192, 9073), (3376, 5891)]