21278649

素因数分解:

$3^1\times 7^1\times {\mathrm{271}}^1\times {\mathrm{3739}}^1$

素因数の和:4020

約数の個数: 16

約数和(自身を含む): 32552960

約数和(自身を除く): 11274311

約数列:

[1, 3, 7, 21, 271, 813, 1897, 3739, 5691, 11217, 26173, 78519, 1013269, 3039807, 7092883, 21278649]

約数ペア:

[(1, 21278649), (3, 7092883), (7, 3039807), (21, 1013269), (271, 78519), (813, 26173), (1897, 11217), (3739, 5691)]