21045790

素因数分解:

$2^1\times 5^1\times {\mathrm{421}}^1\times {\mathrm{4999}}^1$

素因数の和:5427

約数の個数: 16

約数和(自身を含む): 37980000

約数和(自身を除く): 16934210

約数列:

[1, 2, 5, 10, 421, 842, 2105, 4210, 4999, 9998, 24995, 49990, 2104579, 4209158, 10522895, 21045790]

約数ペア:

[(1, 21045790), (2, 10522895), (5, 4209158), (10, 2104579), (421, 49990), (842, 24995), (2105, 9998), (4210, 4999)]