21117681

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{199}}^1\times {\mathrm{907}}^1$

素因数の和:1125

約数の個数: 24

約数和(自身を含む): 33051200

約数和(自身を除く): 11933519

約数列:

[1, 3, 9, 13, 39, 117, 199, 597, 907, 1791, 2587, 2721, 7761, 8163, 11791, 23283, 35373, 106119, 180493, 541479, 1624437, 2346409, 7039227, 21117681]

約数ペア:

[(1, 21117681), (3, 7039227), (9, 2346409), (13, 1624437), (39, 541479), (117, 180493), (199, 106119), (597, 35373), (907, 23283), (1791, 11791), (2587, 8163), (2721, 7761)]