21491259

素因数分解:

$3^1\times {\mathrm{103}}^1\times {\mathrm{157}}^1\times {\mathrm{443}}^1$

素因数の和:706

約数の個数: 16

約数和(自身を含む): 29183232

約数和(自身を除く): 7691973

約数列:

[1, 3, 103, 157, 309, 443, 471, 1329, 16171, 45629, 48513, 69551, 136887, 208653, 7163753, 21491259]

約数ペア:

[(1, 21491259), (3, 7163753), (103, 208653), (157, 136887), (309, 69551), (443, 48513), (471, 45629), (1329, 16171)]