Prueba caracteres en miles
JavaScript
function formatNumber(number)
{
var number = number.toFixed(0) + '';
var x = number.split('.');
var x1 = x[0];
var x2 = x.length > 1 ? '.' + x[1] : '';
var rgx = /(\d+)(\d{3})/;
while (rgx.test(x1)) {
x1 = x1.replace(rgx, '$1' + ',' + '$2');
}
return x1 + x2;
}
console.log(formatNumber(2000));