21142917

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{631}}^1$

素因数の和:730

約数の個数: 32

約数和(自身を含む): 33672960

約数和(自身を除く): 12530043

約数列:

[1, 3, 9, 17, 27, 51, 73, 153, 219, 459, 631, 657, 1241, 1893, 1971, 3723, 5679, 10727, 11169, 17037, 32181, 33507, 46063, 96543, 138189, 289629, 414567, 783071, 1243701, 2349213, 7047639, 21142917]

約数ペア:

[(1, 21142917), (3, 7047639), (9, 2349213), (17, 1243701), (27, 783071), (51, 414567), (73, 289629), (153, 138189), (219, 96543), (459, 46063), (631, 33507), (657, 32181), (1241, 17037), (1893, 11169), (1971, 10727), (3723, 5679)]