19979939

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{193}}^1\times {\mathrm{643}}^1$

素因数の和:866

約数の個数: 16

約数和(自身を含む): 23987712

約数和(自身を除く): 4007773

約数列:

[1, 7, 23, 161, 193, 643, 1351, 4439, 4501, 14789, 31073, 103523, 124099, 868693, 2854277, 19979939]

約数ペア:

[(1, 19979939), (7, 2854277), (23, 868693), (161, 124099), (193, 103523), (643, 31073), (1351, 14789), (4439, 4501)]