21248941

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{191}}^1\times {\mathrm{691}}^1$

素因数の和:912

約数の個数: 16

約数和(自身を含む): 25509888

約数和(自身を除く): 4260947

約数列:

[1, 7, 23, 161, 191, 691, 1337, 4393, 4837, 15893, 30751, 111251, 131981, 923867, 3035563, 21248941]

約数ペア:

[(1, 21248941), (7, 3035563), (23, 923867), (161, 131981), (191, 111251), (691, 30751), (1337, 15893), (4393, 4837)]