21720118

素因数分解:

$2^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{263}}^1\times {\mathrm{347}}^1$

素因数の和:636

約数の個数: 32

約数和(自身を含む): 39688704

約数和(自身を除く): 17968586

約数列:

[1, 2, 7, 14, 17, 34, 119, 238, 263, 347, 526, 694, 1841, 2429, 3682, 4471, 4858, 5899, 8942, 11798, 31297, 41293, 62594, 82586, 91261, 182522, 638827, 1277654, 1551437, 3102874, 10860059, 21720118]

約数ペア:

[(1, 21720118), (2, 10860059), (7, 3102874), (14, 1551437), (17, 1277654), (34, 638827), (119, 182522), (238, 91261), (263, 82586), (347, 62594), (526, 41293), (694, 31297), (1841, 11798), (2429, 8942), (3682, 5899), (4471, 4858)]