21399805

素因数分解:

$5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{13009}}^1$

素因数の和:13068

約数の個数: 16

約数和(自身を含む): 29975040

約数和(自身を除く): 8575235

約数列:

[1, 5, 7, 35, 47, 235, 329, 1645, 13009, 65045, 91063, 455315, 611423, 3057115, 4279961, 21399805]

約数ペア:

[(1, 21399805), (5, 4279961), (7, 3057115), (35, 611423), (47, 455315), (235, 91063), (329, 65045), (1645, 13009)]