21181292

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{107}}^1\times {\mathrm{409}}^1$

素因数の和:542

約数の個数: 36

約数和(自身を含む): 41224680

約数和(自身を除く): 20043388

約数列:

[1, 2, 4, 11, 22, 44, 107, 121, 214, 242, 409, 428, 484, 818, 1177, 1636, 2354, 4499, 4708, 8998, 12947, 17996, 25894, 43763, 49489, 51788, 87526, 98978, 175052, 197956, 481393, 962786, 1925572, 5295323, 10590646, 21181292]

約数ペア:

[(1, 21181292), (2, 10590646), (4, 5295323), (11, 1925572), (22, 962786), (44, 481393), (107, 197956), (121, 175052), (214, 98978), (242, 87526), (409, 51788), (428, 49489), (484, 43763), (818, 25894), (1177, 17996), (1636, 12947), (2354, 8998), (4499, 4708)]