21989799

素因数分解:

$3^5\times {\mathrm{13}}^1\times {\mathrm{6961}}^1$

素因数の和:6989

約数の個数: 24

約数和(自身を含む): 35478352

約数和(自身を除く): 13488553

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 243, 351, 1053, 3159, 6961, 20883, 62649, 90493, 187947, 271479, 563841, 814437, 1691523, 2443311, 7329933, 21989799]

約数ペア:

[(1, 21989799), (3, 7329933), (9, 2443311), (13, 1691523), (27, 814437), (39, 563841), (81, 271479), (117, 187947), (243, 90493), (351, 62649), (1053, 20883), (3159, 6961)]