20578640

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3623}}^1$

素因数の和:3707

約数の個数: 40

約数和(自身を含む): 48532608

約数和(自身を除く): 27953968

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3623, 5680, 7246, 14492, 18115, 28984, 36230, 57968, 72460, 144920, 257233, 289840, 514466, 1028932, 1286165, 2057864, 2572330, 4115728, 5144660, 10289320, 20578640]

約数ペア:

[(1, 20578640), (2, 10289320), (4, 5144660), (5, 4115728), (8, 2572330), (10, 2057864), (16, 1286165), (20, 1028932), (40, 514466), (71, 289840), (80, 257233), (142, 144920), (284, 72460), (355, 57968), (568, 36230), (710, 28984), (1136, 18115), (1420, 14492), (2840, 7246), (3623, 5680)]