21540080

素因数分解:

$2^4\times 5^1\times {\mathrm{269251}}^1$

素因数の和:269264

約数の個数: 20

約数和(自身を含む): 50080872

約数和(自身を除く): 28540792

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 269251, 538502, 1077004, 1346255, 2154008, 2692510, 4308016, 5385020, 10770040, 21540080]

約数ペア:

[(1, 21540080), (2, 10770040), (4, 5385020), (5, 4308016), (8, 2692510), (10, 2154008), (16, 1346255), (20, 1077004), (40, 538502), (80, 269251)]