21345080

素因数分解:

$2^3\times 5^1\times {\mathrm{263}}^1\times {\mathrm{2029}}^1$

素因数の和:2303

約数の個数: 32

約数和(自身を含む): 48232800

約数和(自身を除く): 26887720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 263, 526, 1052, 1315, 2029, 2104, 2630, 4058, 5260, 8116, 10145, 10520, 16232, 20290, 40580, 81160, 533627, 1067254, 2134508, 2668135, 4269016, 5336270, 10672540, 21345080]

約数ペア:

[(1, 21345080), (2, 10672540), (4, 5336270), (5, 4269016), (8, 2668135), (10, 2134508), (20, 1067254), (40, 533627), (263, 81160), (526, 40580), (1052, 20290), (1315, 16232), (2029, 10520), (2104, 10145), (2630, 8116), (4058, 5260)]