21840078

素因数分解:

$2^1\times 3^1\times {\mathrm{13}}^1\times {\mathrm{280001}}^1$

素因数の和:280019

約数の個数: 16

約数和(自身を含む): 47040336

約数和(自身を除く): 25200258

約数列:

[1, 2, 3, 6, 13, 26, 39, 78, 280001, 560002, 840003, 1680006, 3640013, 7280026, 10920039, 21840078]

約数ペア:

[(1, 21840078), (2, 10920039), (3, 7280026), (6, 3640013), (13, 1680006), (26, 840003), (39, 560002), (78, 280001)]