20921789

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{4481}}^1$

素因数の和:4540

約数の個数: 16

約数和(自身を含む): 25816320

約数和(自身を除く): 4894531

約数列:

[1, 7, 23, 29, 161, 203, 667, 4481, 4669, 31367, 103063, 129949, 721441, 909643, 2988827, 20921789]

約数ペア:

[(1, 20921789), (7, 2988827), (23, 909643), (29, 721441), (161, 129949), (203, 103063), (667, 31367), (4481, 4669)]