21057778

素因数分解:

$2^1\times 7^1\times {\mathrm{521}}^1\times {\mathrm{2887}}^1$

素因数の和:3417

約数の個数: 16

約数和(自身を含む): 36180864

約数和(自身を除く): 15123086

約数列:

[1, 2, 7, 14, 521, 1042, 2887, 3647, 5774, 7294, 20209, 40418, 1504127, 3008254, 10528889, 21057778]

約数ペア:

[(1, 21057778), (2, 10528889), (7, 3008254), (14, 1504127), (521, 40418), (1042, 20209), (2887, 7294), (3647, 5774)]