21780717

素因数分解:

$3^1\times 7^1\times {\mathrm{41}}^2\times {\mathrm{617}}^1$

素因数の和:709

約数の個数: 24

約数和(自身を含む): 34074048

約数和(自身を除く): 12293331

約数列:

[1, 3, 7, 21, 41, 123, 287, 617, 861, 1681, 1851, 4319, 5043, 11767, 12957, 25297, 35301, 75891, 177079, 531237, 1037177, 3111531, 7260239, 21780717]

約数ペア:

[(1, 21780717), (3, 7260239), (7, 3111531), (21, 1037177), (41, 531237), (123, 177079), (287, 75891), (617, 35301), (861, 25297), (1681, 12957), (1851, 11767), (4319, 5043)]