function findIt(){
var ss = SpreadsheetApp.openByUrl("https://docs.google.com/spreadsheets/d/15keYHAjMjK766xjNzuYCn0hJLYu_jIcDPKv83Ihfn6k/edit#gid=0");
var sheet = ss.getActiveSheet();
var data = sheet.getDataRange().getValues();
var dataExploded = [];
for (var x = 0; x < sheet.getLastRow();x++){
for (var y = 0; y < sheet.getLastColumn();y++){
dataExploded.push(data[x][y]);
}
}
if (dataExploded.indexOf(20) != -1){
Logger.log(dataExploded.indexOf(20));
Logger.log("Row: "+(dataExploded.indexOf(20)+1)-sheet.getLastRow());
Logger.log("Column: "+(dataExploded.indexOf(20)+1)/sheet.getLastColumn());
}
// Logger.log(data.indexOf(20));
}