20978853

素因数分解:

$3^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{7187}}^1$

素因数の和:7336

約数の個数: 16

約数和(自身を含む): 32202240

約数和(自身を除く): 11223387

約数列:

[1, 3, 7, 21, 139, 417, 973, 2919, 7187, 21561, 50309, 150927, 998993, 2996979, 6992951, 20978853]

約数ペア:

[(1, 20978853), (3, 6992951), (7, 2996979), (21, 998993), (139, 150927), (417, 50309), (973, 21561), (2919, 7187)]