Eteros ego is a 2016 Greek crime thriller film directed by Sotiris Tsafoulias that uses mathematics to solve a series of interrelated murders. The main character, forensic scientist Professor Dimitris, works with a mathematics professor played by French actor François Cluzet to decipher clues left by the killer. They discover that the killer is using the mathematical concept of amicable numbers, in which the sum of the proper divisors of each number equals the other number, as symbolized by the smallest pair of amicable numbers 220 and 284, to determine the order and method of the murders.

1. Eteros ego
(The Other Me)
ZOE KOLLA
3RD “CINEMATHS PARADISE” MEETING
2016-17

2. About the movie
 Eteros ego (2016) is a crime thriller with mystery, exciting riddles and many
mathematical references, made by Sotiris Tsafoulias. The main character is
an eccentric forensic scientist and professor, named Dimitris, who helps
the police authorities demystify a series of interrelated murders. The key
role has a maths professor, played by François Cluzet, who helps Dimitris
solve the mystery and discover the truth behind all these murders.

3. Π,
François Cluzet, Sotiris Tsafoulias and
Pygmalion Dadakaridis (the main
character)
François Cluzet

4. Mathematical references
 The mathematical references that help the main character find the killer is
the theory of amicable numbers (also known as friendly numbers),
explained by the maths professor in the movie. They are two different
numbers so related that the sum of the proper divisors of each is equal to
the other number.
 220 and 284 is the smallest pair of amicable numbers and it’s the pair used
in the movie.