21390383

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{193}}^1\times {\mathrm{223}}^1$

素因数の和:494

約数の個数: 16

約数和(自身を含む): 25030656

約数和(自身を除く): 3640273

約数列:

[1, 7, 71, 193, 223, 497, 1351, 1561, 13703, 15833, 43039, 95921, 110831, 301273, 3055769, 21390383]

約数ペア:

[(1, 21390383), (7, 3055769), (71, 301273), (193, 110831), (223, 95921), (497, 43039), (1351, 15833), (1561, 13703)]