21155787

素因数分解:

$3^2\times {\mathrm{83}}^1\times {\mathrm{127}}^1\times {\mathrm{223}}^1$

素因数の和:439

約数の個数: 24

約数和(自身を含む): 31309824

約数和(自身を除く): 10154037

約数列:

[1, 3, 9, 83, 127, 223, 249, 381, 669, 747, 1143, 2007, 10541, 18509, 28321, 31623, 55527, 84963, 94869, 166581, 254889, 2350643, 7051929, 21155787]

約数ペア:

[(1, 21155787), (3, 7051929), (9, 2350643), (83, 254889), (127, 166581), (223, 94869), (249, 84963), (381, 55527), (669, 31623), (747, 28321), (1143, 18509), (2007, 10541)]