21005481

素因数分解:

$3^1\times 7^1\times {\mathrm{271}}^1\times {\mathrm{3691}}^1$

素因数の和:3972

約数の個数: 16

約数和(自身を含む): 32135168

約数和(自身を除く): 11129687

約数列:

[1, 3, 7, 21, 271, 813, 1897, 3691, 5691, 11073, 25837, 77511, 1000261, 3000783, 7001827, 21005481]

約数ペア:

[(1, 21005481), (3, 7001827), (7, 3000783), (21, 1000261), (271, 77511), (813, 25837), (1897, 11073), (3691, 5691)]