21178328

素因数分解:

$2^3\times {\mathrm{17}}^1\times {\mathrm{155723}}^1$

素因数の和:155746

約数の個数: 16

約数和(自身を含む): 42045480

約数和(自身を除く): 20867152

約数列:

[1, 2, 4, 8, 17, 34, 68, 136, 155723, 311446, 622892, 1245784, 2647291, 5294582, 10589164, 21178328]

約数ペア:

[(1, 21178328), (2, 10589164), (4, 5294582), (8, 2647291), (17, 1245784), (34, 622892), (68, 311446), (136, 155723)]