20170 has 8 divisors (see below), whose sum is σ = 36324. Its totient is φ = 8064.

The previous prime is 20161. The next prime is 20173. The reversal of 20170 is 7102.

It can be written as a sum of positive squares in 2 ways, for example, as 19881 + 289 = 141^2 + 17^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2017 = 20170 / (2 + 0 + 1 + 7 + 0).

It is not an unprimeable number, because it can be changed into a prime (20173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999 + ... + 1018.

2²⁰¹⁷⁰ is an apocalyptic number.

20170 is a deficient number, since it is larger than the sum of its proper divisors (16154).

20170 is a wasteful number, since it uses less digits than its factorization.

20170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024.

The product of its (nonzero) digits is 14, while the sum is 10.

The square root of 20170 is about 142.0211251892. The cubic root of 20170 is about 27.2208677809.

Adding to 20170 its reverse (7102), we get a palindrome (27272).

It can be divided in two parts, 20 and 170, that added together give a triangular number (190 = T₁₉).

The spelling of 20170 in words is "twenty thousand, one hundred seventy", and thus it is an iban number.