21108280

素因数分解:

$2^3\times 5^1\times {\mathrm{523}}^1\times {\mathrm{1009}}^1$

素因数の和:1543

約数の個数: 32

約数和(自身を含む): 47631600

約数和(自身を除く): 26523320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 523, 1009, 1046, 2018, 2092, 2615, 4036, 4184, 5045, 5230, 8072, 10090, 10460, 20180, 20920, 40360, 527707, 1055414, 2110828, 2638535, 4221656, 5277070, 10554140, 21108280]

約数ペア:

[(1, 21108280), (2, 10554140), (4, 5277070), (5, 4221656), (8, 2638535), (10, 2110828), (20, 1055414), (40, 527707), (523, 40360), (1009, 20920), (1046, 20180), (2018, 10460), (2092, 10090), (2615, 8072), (4036, 5230), (4184, 5045)]