21403521

素因数分解:

$3^4\times {\mathrm{89}}^1\times {\mathrm{2969}}^1$

素因数の和:3070

約数の個数: 20

約数和(自身を含む): 32343300

約数和(自身を除く): 10939779

約数列:

[1, 3, 9, 27, 81, 89, 267, 801, 2403, 2969, 7209, 8907, 26721, 80163, 240489, 264241, 792723, 2378169, 7134507, 21403521]

約数ペア:

[(1, 21403521), (3, 7134507), (9, 2378169), (27, 792723), (81, 264241), (89, 240489), (267, 80163), (801, 26721), (2403, 8907), (2969, 7209)]