Divided by 2 has more numbers even if it is infinite because compared to 3 ,4, or any other number the amount of divisible numbers are more and keep getting more. If there was a race between a car and a bicycle with both having infinite amount of fuel and stamina, the car would always be ahead and increasing its lead. Same with the numbers they would never be the same after the start.
@Repete while its true that some infinities are bigger then other infinities.. in this case where its all countable infinities they are all the same amount