21147723

素因数分解:

$3^4\times {\mathrm{131}}^1\times {\mathrm{1993}}^1$

素因数の和:2136

約数の個数: 20

約数和(自身を含む): 31848168

約数和(自身を除く): 10700445

約数列:

[1, 3, 9, 27, 81, 131, 393, 1179, 1993, 3537, 5979, 10611, 17937, 53811, 161433, 261083, 783249, 2349747, 7049241, 21147723]

約数ペア:

[(1, 21147723), (3, 7049241), (9, 2349747), (27, 783249), (81, 261083), (131, 161433), (393, 53811), (1179, 17937), (1993, 10611), (3537, 5979)]