21388895

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{157}}^1\times {\mathrm{2477}}^1$

素因数の和:2650

約数の個数: 16

約数和(自身を含む): 28189728

約数和(自身を除く): 6800833

約数列:

[1, 5, 11, 55, 157, 785, 1727, 2477, 8635, 12385, 27247, 136235, 388889, 1944445, 4277779, 21388895]

約数ペア:

[(1, 21388895), (5, 4277779), (11, 1944445), (55, 388889), (157, 136235), (785, 27247), (1727, 12385), (2477, 8635)]