21128985

素因数分解:

$3^3\times 5^1\times {\mathrm{156511}}^1$

素因数の和:156525

約数の個数: 16

約数和(自身を含む): 37562880

約数和(自身を除く): 16433895

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 156511, 469533, 782555, 1408599, 2347665, 4225797, 7042995, 21128985]

約数ペア:

[(1, 21128985), (3, 7042995), (5, 4225797), (9, 2347665), (15, 1408599), (27, 782555), (45, 469533), (135, 156511)]