21556521

素因数分解:

$3^2\times 7^3\times {\mathrm{6983}}^1$

素因数の和:7010

約数の個数: 24

約数和(自身を含む): 36316800

約数和(自身を除く): 14760279

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 343, 441, 1029, 3087, 6983, 20949, 48881, 62847, 146643, 342167, 439929, 1026501, 2395169, 3079503, 7185507, 21556521]

約数ペア:

[(1, 21556521), (3, 7185507), (7, 3079503), (9, 2395169), (21, 1026501), (49, 439929), (63, 342167), (147, 146643), (343, 62847), (441, 48881), (1029, 20949), (3087, 6983)]