21205557

素因数分解:

$3^4\times {\mathrm{389}}^1\times {\mathrm{673}}^1$

素因数の和:1074

約数の個数: 20

約数和(自身を含む): 31806060

約数和(自身を除く): 10600503

約数列:

[1, 3, 9, 27, 81, 389, 673, 1167, 2019, 3501, 6057, 10503, 18171, 31509, 54513, 261797, 785391, 2356173, 7068519, 21205557]

約数ペア:

[(1, 21205557), (3, 7068519), (9, 2356173), (27, 785391), (81, 261797), (389, 54513), (673, 31509), (1167, 18171), (2019, 10503), (3501, 6057)]