21640365

素因数分解:

$3^7\times 5^1\times {\mathrm{1979}}^1$

素因数の和:2005

約数の個数: 32

約数和(自身を含む): 38966400

約数和(自身を除く): 17326035

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 729, 1215, 1979, 2187, 3645, 5937, 9895, 10935, 17811, 29685, 53433, 89055, 160299, 267165, 480897, 801495, 1442691, 2404485, 4328073, 7213455, 21640365]

約数ペア:

[(1, 21640365), (3, 7213455), (5, 4328073), (9, 2404485), (15, 1442691), (27, 801495), (45, 480897), (81, 267165), (135, 160299), (243, 89055), (405, 53433), (729, 29685), (1215, 17811), (1979, 10935), (2187, 9895), (3645, 5937)]