21689187

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{127}}^1\times {\mathrm{151}}^1$

素因数の和:323

約数の個数: 32

約数和(自身を含む): 32686080

約数和(自身を除く): 10996893

約数列:

[1, 3, 13, 29, 39, 87, 127, 151, 377, 381, 453, 1131, 1651, 1963, 3683, 4379, 4953, 5889, 11049, 13137, 19177, 47879, 56927, 57531, 143637, 170781, 249301, 556133, 747903, 1668399, 7229729, 21689187]

約数ペア:

[(1, 21689187), (3, 7229729), (13, 1668399), (29, 747903), (39, 556133), (87, 249301), (127, 170781), (151, 143637), (377, 57531), (381, 56927), (453, 47879), (1131, 19177), (1651, 13137), (1963, 11049), (3683, 5889), (4379, 4953)]