21187856

素因数分解:

$2^4\times {\mathrm{109}}^1\times {\mathrm{12149}}^1$

素因数の和:12266

約数の個数: 20

約数和(自身を含む): 41431500

約数和(自身を除く): 20243644

約数列:

[1, 2, 4, 8, 16, 109, 218, 436, 872, 1744, 12149, 24298, 48596, 97192, 194384, 1324241, 2648482, 5296964, 10593928, 21187856]

約数ペア:

[(1, 21187856), (2, 10593928), (4, 5296964), (8, 2648482), (16, 1324241), (109, 194384), (218, 97192), (436, 48596), (872, 24298), (1744, 12149)]