21399959

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{2179}}^1$

素因数の和:2270

約数の個数: 16

約数和(自身を含む): 25950720

約数和(自身を除く): 4550761

約数列:

[1, 7, 23, 61, 161, 427, 1403, 2179, 9821, 15253, 50117, 132919, 350819, 930433, 3057137, 21399959]

約数ペア:

[(1, 21399959), (7, 3057137), (23, 930433), (61, 350819), (161, 132919), (427, 50117), (1403, 15253), (2179, 9821)]