21328420

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13499}}^1$

素因数の和:13587

約数の個数: 24

約数和(自身を含む): 45360000

約数和(自身を除く): 24031580

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13499, 26998, 53996, 67495, 134990, 269980, 1066421, 2132842, 4265684, 5332105, 10664210, 21328420]

約数ペア:

[(1, 21328420), (2, 10664210), (4, 5332105), (5, 4265684), (10, 2132842), (20, 1066421), (79, 269980), (158, 134990), (316, 67495), (395, 53996), (790, 26998), (1580, 13499)]