We have investigated the influence of Landau quantization both on the field and temperature dependence of some properties of singlet and triplet type4 superconductors. In particular, we consider a multichannel structure of the superconducting gap function, oscillations of the critical temperature with increasing magnetic field and a possible reentrance of superconductivity. In addition, de Haas-van Alphen-like oscillations of the specific heat and its jumps at the critical temperatures have also been analyzed.