20405115

素因数分解:

$3^4\times 5^1\times {\mathrm{50383}}^1$

素因数の和:50400

約数の個数: 20

約数和(自身を含む): 36578784

約数和(自身を除く): 16173669

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 50383, 151149, 251915, 453447, 755745, 1360341, 2267235, 4081023, 6801705, 20405115]

約数ペア:

[(1, 20405115), (3, 6801705), (5, 4081023), (9, 2267235), (15, 1360341), (27, 755745), (45, 453447), (81, 251915), (135, 151149), (405, 50383)]