21821805

素因数分解:

$3^4\times 5^1\times {\mathrm{53881}}^1$

素因数の和:53898

約数の個数: 20

約数和(自身を含む): 39118332

約数和(自身を除く): 17296527

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 53881, 161643, 269405, 484929, 808215, 1454787, 2424645, 4364361, 7273935, 21821805]

約数ペア:

[(1, 21821805), (3, 7273935), (5, 4364361), (9, 2424645), (15, 1454787), (27, 808215), (45, 484929), (81, 269405), (135, 161643), (405, 53881)]