21056517

素因数分解:

$3^4\times {\mathrm{47}}^1\times {\mathrm{5531}}^1$

素因数の和:5590

約数の個数: 20

約数和(自身を含む): 32129856

約数和(自身を除く): 11073339

約数列:

[1, 3, 9, 27, 47, 81, 141, 423, 1269, 3807, 5531, 16593, 49779, 149337, 259957, 448011, 779871, 2339613, 7018839, 21056517]

約数ペア:

[(1, 21056517), (3, 7018839), (9, 2339613), (27, 779871), (47, 448011), (81, 259957), (141, 149337), (423, 49779), (1269, 16593), (3807, 5531)]