Because 'intelligence' is not a coherent measure your question cannot be answered exactly. Aspects of human thinking, such as calculating, remembering, measuring, estimating can all be replicated by AI applications for these are all human mental skills.
You have to analyse something that you think of as 'intelligent' such as picking the two identical items from a varied array. You see how specific an example I give?
Not a general response such as 'attentive' or 'discerning' So to make a robot or application perform an 'intelligent' task, that task must be analysed thoroughly until each individual aspect of the skill is noted, an then it can be copied.