I'm sorry to inform you of this but even an outstanding GRE score, with no research experience or formal math and physics training, isn't going to get you far at all. Very few graduate school physics departments actually require a degree in physics, but most do expect that if you do not have a physics degree you will have a degree in a related field, such as engineering.
Moreover, if you are applying to prestigious graduate schools in the US don't even consider applying for a masters. Most of the better graduate schools will only seriously consider Ph.d. applicants. If you are serious about a masters you should consider a smaller and/or less prestigious school.
If you are absolutely serious about this your best bet would be to obtain an undergraduate degree in physics and then pursue graduate studies. Without this and with your present background it's going to be hard for any admissions committee to seriously consider your application.