21505897

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{223}}^1\times {\mathrm{599}}^1$

素因数の和:852

約数の個数: 16

約数和(自身を含む): 25804800

約数和(自身を除く): 4298903

約数列:

[1, 7, 23, 161, 223, 599, 1561, 4193, 5129, 13777, 35903, 96439, 133577, 935039, 3072271, 21505897]

約数ペア:

[(1, 21505897), (7, 3072271), (23, 935039), (161, 133577), (223, 96439), (599, 35903), (1561, 13777), (4193, 5129)]