21278901

素因数分解:

$3^1\times 7^1\times {\mathrm{431}}^1\times {\mathrm{2351}}^1$

素因数の和:2792

約数の個数: 16

約数和(自身を含む): 32514048

約数和(自身を除く): 11235147

約数列:

[1, 3, 7, 21, 431, 1293, 2351, 3017, 7053, 9051, 16457, 49371, 1013281, 3039843, 7092967, 21278901]

約数ペア:

[(1, 21278901), (3, 7092967), (7, 3039843), (21, 1013281), (431, 49371), (1293, 16457), (2351, 9051), (3017, 7053)]