21390381

素因数分解:

$3^2\times {\mathrm{379}}^1\times {\mathrm{6271}}^1$

素因数の和:6656

約数の個数: 12

約数和(自身を含む): 30983680

約数和(自身を除く): 9593299

約数列:

[1, 3, 9, 379, 1137, 3411, 6271, 18813, 56439, 2376709, 7130127, 21390381]

約数ペア:

[(1, 21390381), (3, 7130127), (9, 2376709), (379, 56439), (1137, 18813), (3411, 6271)]