20578971

素因数分解:

$3^1\times 7^4\times {\mathrm{2857}}^1$

素因数の和:2888

約数の個数: 20

約数和(自身を含む): 32021032

約数和(自身を除く): 11442061

約数列:

[1, 3, 7, 21, 49, 147, 343, 1029, 2401, 2857, 7203, 8571, 19999, 59997, 139993, 419979, 979951, 2939853, 6859657, 20578971]

約数ペア:

[(1, 20578971), (3, 6859657), (7, 2939853), (21, 979951), (49, 419979), (147, 139993), (343, 59997), (1029, 19999), (2401, 8571), (2857, 7203)]