257740

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{263}}^1$

素因数の和:286

約数の個数: 36

約数和(自身を含む): 632016

約数和(自身を除く): 374276

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 263, 490, 526, 980, 1052, 1315, 1841, 2630, 3682, 5260, 7364, 9205, 12887, 18410, 25774, 36820, 51548, 64435, 128870, 257740]

約数ペア:

[(1, 257740), (2, 128870), (4, 64435), (5, 51548), (7, 36820), (10, 25774), (14, 18410), (20, 12887), (28, 9205), (35, 7364), (49, 5260), (70, 3682), (98, 2630), (140, 1841), (196, 1315), (245, 1052), (263, 980), (490, 526)]