21559810

素因数分解:

$2^1\times 5^1\times {\mathrm{491}}^1\times {\mathrm{4391}}^1$

素因数の和:4889

約数の個数: 16

約数和(自身を含む): 38895552

約数和(自身を除く): 17335742

約数列:

[1, 2, 5, 10, 491, 982, 2455, 4391, 4910, 8782, 21955, 43910, 2155981, 4311962, 10779905, 21559810]

約数ペア:

[(1, 21559810), (2, 10779905), (5, 4311962), (10, 2155981), (491, 43910), (982, 21955), (2455, 8782), (4391, 4910)]