21090235

素因数分解:

$5^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1\times {\mathrm{499}}^1$

素因数の和:690

約数の個数: 16

約数和(自身を含む): 25920000

約数和(自身を除く): 4829765

約数列:

[1, 5, 79, 107, 395, 499, 535, 2495, 8453, 39421, 42265, 53393, 197105, 266965, 4218047, 21090235]

約数ペア:

[(1, 21090235), (5, 4218047), (79, 266965), (107, 197105), (395, 53393), (499, 42265), (535, 39421), (2495, 8453)]