21399945

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{203809}}^1$

素因数の和:203824

約数の個数: 16

約数和(自身を含む): 39131520

約数和(自身を除く): 17731575

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 203809, 611427, 1019045, 1426663, 3057135, 4279989, 7133315, 21399945]

約数ペア:

[(1, 21399945), (3, 7133315), (5, 4279989), (7, 3057135), (15, 1426663), (21, 1019045), (35, 611427), (105, 203809)]