21578805

素因数分解:

$3^4\times 5^1\times {\mathrm{53281}}^1$

素因数の和:53298

約数の個数: 20

約数和(自身を含む): 38682732

約数和(自身を除く): 17103927

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 53281, 159843, 266405, 479529, 799215, 1438587, 2397645, 4315761, 7192935, 21578805]

約数ペア:

[(1, 21578805), (3, 7192935), (5, 4315761), (9, 2397645), (15, 1438587), (27, 799215), (45, 479529), (81, 266405), (135, 159843), (405, 53281)]