21887721

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{4933}}^1$

素因数の和:4985

約数の個数: 24

約数和(自身を含む): 34636680

約数和(自身を除く): 12748959

約数列:

[1, 3, 9, 17, 29, 51, 87, 153, 261, 493, 1479, 4437, 4933, 14799, 44397, 83861, 143057, 251583, 429171, 754749, 1287513, 2431969, 7295907, 21887721]

約数ペア:

[(1, 21887721), (3, 7295907), (9, 2431969), (17, 1287513), (29, 754749), (51, 429171), (87, 251583), (153, 143057), (261, 83861), (493, 44397), (1479, 14799), (4437, 4933)]