21388213

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{3121}}^1$

素因数の和:3228

約数の個数: 16

約数和(自身を含む): 26974080

約数和(自身を除く): 5585867

約数列:

[1, 7, 11, 77, 89, 623, 979, 3121, 6853, 21847, 34331, 240317, 277769, 1944383, 3055459, 21388213]

約数ペア:

[(1, 21388213), (7, 3055459), (11, 1944383), (77, 277769), (89, 240317), (623, 34331), (979, 21847), (3121, 6853)]