20991680

素因数分解:

$2^6\times 5^1\times {\mathrm{65599}}^1$

素因数の和:65616

約数の個数: 28

約数和(自身を含む): 49987200

約数和(自身を除く): 28995520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 65599, 131198, 262396, 327995, 524792, 655990, 1049584, 1311980, 2099168, 2623960, 4198336, 5247920, 10495840, 20991680]

約数ペア:

[(1, 20991680), (2, 10495840), (4, 5247920), (5, 4198336), (8, 2623960), (10, 2099168), (16, 1311980), (20, 1049584), (32, 655990), (40, 524792), (64, 327995), (80, 262396), (160, 131198), (320, 65599)]