21457107

素因数分解:

$3^2\times 7^1\times {\mathrm{421}}^1\times {\mathrm{809}}^1$

素因数の和:1243

約数の個数: 24

約数和(自身を含む): 35549280

約数和(自身を除く): 14092173

約数列:

[1, 3, 7, 9, 21, 63, 421, 809, 1263, 2427, 2947, 3789, 5663, 7281, 8841, 16989, 26523, 50967, 340589, 1021767, 2384123, 3065301, 7152369, 21457107]

約数ペア:

[(1, 21457107), (3, 7152369), (7, 3065301), (9, 2384123), (21, 1021767), (63, 340589), (421, 50967), (809, 26523), (1263, 16989), (2427, 8841), (2947, 7281), (3789, 5663)]