21391010

素因数分解:

$2^1\times 5^1\times {\mathrm{421}}^1\times {\mathrm{5081}}^1$

素因数の和:5509

約数の個数: 16

約数和(自身を含む): 38602872

約数和(自身を除く): 17211862

約数列:

[1, 2, 5, 10, 421, 842, 2105, 4210, 5081, 10162, 25405, 50810, 2139101, 4278202, 10695505, 21391010]

約数ペア:

[(1, 21391010), (2, 10695505), (5, 4278202), (10, 2139101), (421, 50810), (842, 25405), (2105, 10162), (4210, 5081)]