21379707

素因数分解:

$3^4\times {\mathrm{61}}^1\times {\mathrm{4327}}^1$

素因数の和:4400

約数の個数: 20

約数和(自身を含む): 32468656

約数和(自身を除く): 11088949

約数列:

[1, 3, 9, 27, 61, 81, 183, 549, 1647, 4327, 4941, 12981, 38943, 116829, 263947, 350487, 791841, 2375523, 7126569, 21379707]

約数ペア:

[(1, 21379707), (3, 7126569), (9, 2375523), (27, 791841), (61, 350487), (81, 263947), (183, 116829), (549, 38943), (1647, 12981), (4327, 4941)]