21909890

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{30859}}^1$

素因数の和:30937

約数の個数: 16

約数和(自身を含む): 39994560

約数和(自身を除く): 18084670

約数列:

[1, 2, 5, 10, 71, 142, 355, 710, 30859, 61718, 154295, 308590, 2190989, 4381978, 10954945, 21909890]

約数ペア:

[(1, 21909890), (2, 10954945), (5, 4381978), (10, 2190989), (71, 308590), (142, 154295), (355, 61718), (710, 30859)]