21278978

素因数分解:

$2^1\times 7^1\times {\mathrm{487}}^1\times {\mathrm{3121}}^1$

素因数の和:3617

約数の個数: 16

約数和(自身を含む): 36564864

約数和(自身を除く): 15285886

約数列:

[1, 2, 7, 14, 487, 974, 3121, 3409, 6242, 6818, 21847, 43694, 1519927, 3039854, 10639489, 21278978]

約数ペア:

[(1, 21278978), (2, 10639489), (7, 3039854), (14, 1519927), (487, 43694), (974, 21847), (3121, 6818), (3409, 6242)]