21205881

素因数分解:

$3^6\times {\mathrm{19}}^1\times {\mathrm{1531}}^1$

素因数の和:1568

約数の個数: 28

約数和(自身を含む): 33489520

約数和(自身を除く): 12283639

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 243, 513, 729, 1531, 1539, 4593, 4617, 13779, 13851, 29089, 41337, 87267, 124011, 261801, 372033, 785403, 1116099, 2356209, 7068627, 21205881]

約数ペア:

[(1, 21205881), (3, 7068627), (9, 2356209), (19, 1116099), (27, 785403), (57, 372033), (81, 261801), (171, 124011), (243, 87267), (513, 41337), (729, 29089), (1531, 13851), (1539, 13779), (4593, 4617)]