19889919

素因数分解:

$3^2\times 7^1\times {\mathrm{491}}^1\times {\mathrm{643}}^1$

素因数の和:1147

約数の個数: 24

約数和(自身を含む): 32952192

約数和(自身を除く): 13062273

約数列:

[1, 3, 7, 9, 21, 63, 491, 643, 1473, 1929, 3437, 4419, 4501, 5787, 10311, 13503, 30933, 40509, 315713, 947139, 2209991, 2841417, 6629973, 19889919]

約数ペア:

[(1, 19889919), (3, 6629973), (7, 2841417), (9, 2209991), (21, 947139), (63, 315713), (491, 40509), (643, 30933), (1473, 13503), (1929, 10311), (3437, 5787), (4419, 4501)]