21390830

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{27077}}^1$

素因数の和:27163

約数の個数: 16

約数和(自身を含む): 38992320

約数和(自身を除く): 17601490

約数列:

[1, 2, 5, 10, 79, 158, 395, 790, 27077, 54154, 135385, 270770, 2139083, 4278166, 10695415, 21390830]

約数ペア:

[(1, 21390830), (2, 10695415), (5, 4278166), (10, 2139083), (79, 270770), (158, 135385), (395, 54154), (790, 27077)]