21657881

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{193}}^1$

素因数の和:281

約数の個数: 32

約数和(自身を含む): 28159488

約数和(自身を除く): 6501607

約数列:

[1, 7, 17, 23, 41, 119, 161, 193, 287, 391, 697, 943, 1351, 2737, 3281, 4439, 4879, 6601, 7913, 16031, 22967, 31073, 55391, 75463, 112217, 134521, 181999, 528241, 941647, 1273993, 3093983, 21657881]

約数ペア:

[(1, 21657881), (7, 3093983), (17, 1273993), (23, 941647), (41, 528241), (119, 181999), (161, 134521), (193, 112217), (287, 75463), (391, 55391), (697, 31073), (943, 22967), (1351, 16031), (2737, 7913), (3281, 6601), (4439, 4879)]