21378478

素因数分解:

$2^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{6991}}^1$

素因数の和:7143

約数の個数: 16

約数和(自身を含む): 35239680

約数和(自身を除く): 13861202

約数列:

[1, 2, 11, 22, 139, 278, 1529, 3058, 6991, 13982, 76901, 153802, 971749, 1943498, 10689239, 21378478]

約数ペア:

[(1, 21378478), (2, 10689239), (11, 1943498), (22, 971749), (139, 153802), (278, 76901), (1529, 13982), (3058, 6991)]