31878639

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{20959}}^1$

素因数の和:20991

約数の個数: 18

約数和(自身を含む): 49863840

約数和(自身を除く): 17985201

約数列:

[1, 3, 9, 13, 39, 117, 169, 507, 1521, 20959, 62877, 188631, 272467, 817401, 2452203, 3542071, 10626213, 31878639]

約数ペア:

[(1, 31878639), (3, 10626213), (9, 3542071), (13, 2452203), (39, 817401), (117, 272467), (169, 188631), (507, 62877), (1521, 20959)]