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Blazars exhibit relentless variability across diverse spatial and temporalfrequencies. The study of long- and short-term variability properties observedin the X-ray band provides insights into the inner workings of the centralengine. In this work, we present timing and spectral analyses of the blazar 3C273 using the X-ray observations from the $\textit{XMM-Newton}$ telescopecovering the period from 2000 to 2020. The methods of timing analyses includeestimation of fractional variability, long- and short-term flux distribution,rms-flux relation, and power spectral density analysis. The spectral analysisinclude estimating a model independent flux hardness ratio and fitting theobservations with multiplicative and additive spectral models such as\textit{power-law}, \textit{log-parabola}, \textit{broken power-law}, and\textit{black body}. The \textit{black body} represents the thermal emissionfrom the accretion disk, while the other models represent the possible energydistributions of the particles emitting synchrotron radiation in the jet.During the past two decades, the source flux changed by of a factor of three,with a considerable fractional variability of 27\%. However, the intradayvariation was found to be moderate. Flux distributions of the individualobservations were consistent with a normal or log-normal distribution, whilethe overall flux distribution including entire observations appear to be rathermulti-modal and of a complex shape. The spectral analyses indicate that\textit{log-parabola} added with a \textit{black body} gives the best fit formost of the observations. The results indicate a complex scenario in which thevariability can be attributed to the intricate interaction between thedisk/corona system and the jet.

Constraining X-ray variability of the blazar 3C 273 using XMM-Newton observations over two decades