21520040

素因数分解:

$2^3\times 5^1\times {\mathrm{538001}}^1$

素因数の和:538012

約数の個数: 16

約数和(自身を含む): 48420180

約数和(自身を除く): 26900140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 538001, 1076002, 2152004, 2690005, 4304008, 5380010, 10760020, 21520040]

約数ペア:

[(1, 21520040), (2, 10760020), (4, 5380010), (5, 4304008), (8, 2690005), (10, 2152004), (20, 1076002), (40, 538001)]