19717187

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{103}}^1$

素因数の和:203

約数の個数: 32

約数和(自身を含む): 25159680

約数和(自身を除く): 5442493

約数列:

[1, 7, 23, 29, 41, 103, 161, 203, 287, 667, 721, 943, 1189, 2369, 2987, 4223, 4669, 6601, 8323, 16583, 20909, 27347, 29561, 68701, 97129, 122467, 191429, 480907, 679903, 857269, 2816741, 19717187]

約数ペア:

[(1, 19717187), (7, 2816741), (23, 857269), (29, 679903), (41, 480907), (103, 191429), (161, 122467), (203, 97129), (287, 68701), (667, 29561), (721, 27347), (943, 20909), (1189, 16583), (2369, 8323), (2987, 6601), (4223, 4669)]