20978991

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{2381}}^1$

素因数の和:2487

約数の個数: 24

約数和(自身を含む): 33443280

約数和(自身を除く): 12464289

約数列:

[1, 3, 9, 11, 33, 89, 99, 267, 801, 979, 2381, 2937, 7143, 8811, 21429, 26191, 78573, 211909, 235719, 635727, 1907181, 2330999, 6992997, 20978991]

約数ペア:

[(1, 20978991), (3, 6992997), (9, 2330999), (11, 1907181), (33, 635727), (89, 235719), (99, 211909), (267, 78573), (801, 26191), (979, 21429), (2381, 8811), (2937, 7143)]