20973981

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{23227}}^1$

素因数の和:23280

約数の個数: 16

約数和(自身を含む): 32705024

約数和(自身を除く): 11731043

約数列:

[1, 3, 7, 21, 43, 129, 301, 903, 23227, 69681, 162589, 487767, 998761, 2996283, 6991327, 20973981]

約数ペア:

[(1, 20973981), (3, 6991327), (7, 2996283), (21, 998761), (43, 487767), (129, 162589), (301, 69681), (903, 23227)]