21171440

素因数分解:

$2^4\times 5^1\times {\mathrm{264643}}^1$

素因数の和:264656

約数の個数: 20

約数和(自身を含む): 49223784

約数和(自身を除く): 28052344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264643, 529286, 1058572, 1323215, 2117144, 2646430, 4234288, 5292860, 10585720, 21171440]

約数ペア:

[(1, 21171440), (2, 10585720), (4, 5292860), (5, 4234288), (8, 2646430), (10, 2117144), (16, 1323215), (20, 1058572), (40, 529286), (80, 264643)]