21559995

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28183}}^1$

素因数の和:28211

約数の個数: 24

約数和(自身を含む): 39570336

約数和(自身を除く): 18010341

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28183, 84549, 140915, 253647, 422745, 479111, 1268235, 1437333, 2395555, 4311999, 7186665, 21559995]

約数ペア:

[(1, 21559995), (3, 7186665), (5, 4311999), (9, 2395555), (15, 1437333), (17, 1268235), (45, 479111), (51, 422745), (85, 253647), (153, 140915), (255, 84549), (765, 28183)]