21399755

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{4637}}^1$

素因数の和:4726

約数の個数: 16

約数和(自身を含む): 28050624

約数和(自身を除く): 6650869

約数列:

[1, 5, 13, 65, 71, 355, 923, 4615, 4637, 23185, 60281, 301405, 329227, 1646135, 4279951, 21399755]

約数ペア:

[(1, 21399755), (5, 4279951), (13, 1646135), (65, 329227), (71, 301405), (355, 60281), (923, 23185), (4615, 4637)]