21187705

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{5003}}^1$

素因数の和:5037

約数の個数: 24

約数和(自身を含む): 31945536

約数和(自身を除く): 10757831

約数列:

[1, 5, 7, 11, 35, 55, 77, 121, 385, 605, 847, 4235, 5003, 25015, 35021, 55033, 175105, 275165, 385231, 605363, 1926155, 3026815, 4237541, 21187705]

約数ペア:

[(1, 21187705), (5, 4237541), (7, 3026815), (11, 1926155), (35, 605363), (55, 385231), (77, 275165), (121, 175105), (385, 55033), (605, 35021), (847, 25015), (4235, 5003)]