21064779

素因数分解:

$3^4\times {\mathrm{31}}^1\times {\mathrm{8389}}^1$

素因数の和:8432

約数の個数: 20

約数和(自身を含む): 32486080

約数和(自身を除く): 11421301

約数列:

[1, 3, 9, 27, 31, 81, 93, 279, 837, 2511, 8389, 25167, 75501, 226503, 260059, 679509, 780177, 2340531, 7021593, 21064779]

約数ペア:

[(1, 21064779), (3, 7021593), (9, 2340531), (27, 780177), (31, 679509), (81, 260059), (93, 226503), (279, 75501), (837, 25167), (2511, 8389)]