Maximum possible amount of ram memory for inspiron 15 3520

Just curious, does anyone know how much is the maximum possible memory that the Inspiron 15 3520 can operate with?

I have an i5 variant with 16gb ram, the spec sheet says it supports 16gb ram max.

I have seen an i7 variant of it supporting upto 32gb ram, so i was wondering if i can use 32gb ram on this i5 variant as well, since the i5 and i7 variants are similar.

Also, crucial (a brand that sells ram) claims on their website that Inspiron 15 3520 can work with upto 64gb ram, which is even more confusing.