Do you want to know if the factors of the number 13 such as thirteenth floor, friday the 13th, and thirteenth room are a real unlucky in reality? We must first define what is the word imperfect number which were often titled to the number 13. An imperfect number is a number either greater or less than the sum of its divisors. For example in the physical view on your two hands if they've ten fingers that means it's perfect because 10 is a perfect number of the fingers for both two hands, but if they have nine fingers which is less than or have eleven which is greater than the perfect number of hands' fingers, it's an imperfect cause that isn't the normal number of hands' fingers. Why the number 13 was often titled as imperfect number?
“When his disciples heard it, they were exceedingly amazed...” Matthew 19:25 “Jesus said to them, ‘Verily I say to you, that ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also sit on twelve thrones, judging the twelve tribes of Israel.’” Matt. 19:28
“When the hour was come, Jesus sat down, and the twelve apostles with him. And he said to them...” Luke 22:14-15 ‘Ye are they which have continued with me in my temptations. And I appoint to you a kingdom, as my Father had appointed to me, that ye may eat and drink at my table in my kingdom, and sit on thrones judging the twelve tribes of Israel.’ Lu. 22:28-30
In biblical view the number twelve is considered as a perfect number because it is the number of the original apostles of Jesus Christ which will be sat on the 12 thrones judging the 12 tribes of Israel. Therefore, over than that number is an imperfect such as thirteen. And there are also a miscellaneous saying which came from his last supper, that if there were thirteen people around the table, one of them will die. What a commandment of a man!
“And they prayed, and said, ‘You, Lord, who know the hearts of all men, shew whether of these two you have chosen, that he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place.’ And they gave forth their lots, and the lot fell on Matthias, and he was numbered with the eleven apostles.” Acts 1:24-26