21139640

素因数分解:

$2^3\times 5^1\times {\mathrm{528491}}^1$

素因数の和:528502

約数の個数: 16

約数和(自身を含む): 47564280

約数和(自身を除く): 26424640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 528491, 1056982, 2113964, 2642455, 4227928, 5284910, 10569820, 21139640]

約数ペア:

[(1, 21139640), (2, 10569820), (4, 5284910), (5, 4227928), (8, 2642455), (10, 2113964), (20, 1056982), (40, 528491)]