21528591

素因数分解:

$3^1\times 7^2\times {\mathrm{137}}^1\times {\mathrm{1069}}^1$

素因数の和:1223

約数の個数: 24

約数和(自身を含む): 33666480

約数和(自身を除く): 12137889

約数列:

[1, 3, 7, 21, 49, 137, 147, 411, 959, 1069, 2877, 3207, 6713, 7483, 20139, 22449, 52381, 146453, 157143, 439359, 1025171, 3075513, 7176197, 21528591]

約数ペア:

[(1, 21528591), (3, 7176197), (7, 3075513), (21, 1025171), (49, 439359), (137, 157143), (147, 146453), (411, 52381), (959, 22449), (1069, 20139), (2877, 7483), (3207, 6713)]