21505107

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{3967}}^1$

素因数の和:4122

約数の個数: 16

約数和(自身を含む): 31109120

約数和(自身を除く): 9604013

約数列:

[1, 3, 13, 39, 139, 417, 1807, 3967, 5421, 11901, 51571, 154713, 551413, 1654239, 7168369, 21505107]

約数ペア:

[(1, 21505107), (3, 7168369), (13, 1654239), (39, 551413), (139, 154713), (417, 51571), (1807, 11901), (3967, 5421)]