21185440

素因数分解:

$2^5\times 5^1\times {\mathrm{132409}}^1$

素因数の和:132424

約数の個数: 24

約数和(自身を含む): 50050980

約数和(自身を除く): 28865540

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 132409, 264818, 529636, 662045, 1059272, 1324090, 2118544, 2648180, 4237088, 5296360, 10592720, 21185440]

約数ペア:

[(1, 21185440), (2, 10592720), (4, 5296360), (5, 4237088), (8, 2648180), (10, 2118544), (16, 1324090), (20, 1059272), (32, 662045), (40, 529636), (80, 264818), (160, 132409)]