21987021

素因数分解:

$3^1\times 7^1\times {\mathrm{811}}^1\times {\mathrm{1291}}^1$

素因数の和:2112

約数の個数: 16

約数和(自身を含む): 33571328

約数和(自身を除く): 11584307

約数列:

[1, 3, 7, 21, 811, 1291, 2433, 3873, 5677, 9037, 17031, 27111, 1047001, 3141003, 7329007, 21987021]

約数ペア:

[(1, 21987021), (3, 7329007), (7, 3141003), (21, 1047001), (811, 27111), (1291, 17031), (2433, 9037), (3873, 5677)]