20997981

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{21019}}^1$

素因数の和:21065

約数の個数: 16

約数和(自身を含む): 31950400

約数和(自身を除く): 10952419

約数列:

[1, 3, 9, 27, 37, 111, 333, 999, 21019, 63057, 189171, 567513, 777703, 2333109, 6999327, 20997981]

約数ペア:

[(1, 20997981), (3, 6999327), (9, 2333109), (27, 777703), (37, 567513), (111, 189171), (333, 63057), (999, 21019)]