21540805

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{641}}^1$

素因数の和:717

約数の個数: 32

約数和(自身を含む): 31062528

約数和(自身を除く): 9521723

約数列:

[1, 5, 11, 13, 47, 55, 65, 143, 235, 517, 611, 641, 715, 2585, 3055, 3205, 6721, 7051, 8333, 30127, 33605, 35255, 41665, 91663, 150635, 331397, 391651, 458315, 1656985, 1958255, 4308161, 21540805]

約数ペア:

[(1, 21540805), (5, 4308161), (11, 1958255), (13, 1656985), (47, 458315), (55, 391651), (65, 331397), (143, 150635), (235, 91663), (517, 41665), (611, 35255), (641, 33605), (715, 30127), (2585, 8333), (3055, 7051), (3205, 6721)]