21499810

素因数分解:

$2^1\times 5^1\times {\mathrm{647}}^1\times {\mathrm{3323}}^1$

素因数の和:3977

約数の個数: 16

約数和(自身を含む): 38771136

約数和(自身を除く): 17271326

約数列:

[1, 2, 5, 10, 647, 1294, 3235, 3323, 6470, 6646, 16615, 33230, 2149981, 4299962, 10749905, 21499810]

約数ペア:

[(1, 21499810), (2, 10749905), (5, 4299962), (10, 2149981), (647, 33230), (1294, 16615), (3235, 6646), (3323, 6470)]