20169 has 12 divisors (see below), whose sum is σ = 30576.
Its totient is φ = 13284.
The previous prime is 20161. The next prime is 20173. The reversal of 20169 is 96102.
It can be divided in two parts, 2016 and 9, that added together give a square (2025 = 452).
20169 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 20169 - 23 = 20161 is a prime.
It is a super-2 number, since 2×201692 = 813577122, which contains 22 as substring.
It is an Ulam number.
20169 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (20161) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202 + ... + 284.
It is an arithmetic number, because the mean of its divisors is an integer number (2548).
220169 is an apocalyptic number.
It is an amenable number.
20169 is a deficient number, since it is larger than the sum of its proper divisors (10407).
20169 is an frugal number, since it uses more digits than its factorization.
20169 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 98 (or 86 counting only the distinct ones).
The product of its (nonzero) digits is 108, while the sum is 18.
The square root of 20169 is about 142.0176045425.
The cubic root of 20169 is about 27.2204179161.
The spelling of 20169 in words is "twenty thousand, one hundred sixty-nine".