20207 has 6 divisors (see below), whose sum is σ = 22344. Its totient is φ = 18260.

The previous prime is 20201. The next prime is 20219. The reversal of 20207 is 70202.

It is not a de Polignac number, because 20207 - 2⁶ = 20143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (11).

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20207.

It is not an unprimeable number, because it can be changed into a prime (20201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38 + ... + 204.

It is an arithmetic number, because the mean of its divisors is an integer number (3724).

2²⁰²⁰⁷ is an apocalyptic number.

20207 is a deficient number, since it is larger than the sum of its proper divisors (2137).

20207 is a wasteful number, since it uses less digits than its factorization.

20207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 11.

The square root of 20207 is about 142.1513278165. The cubic root of 20207 is about 27.2375023352.

Adding to 20207 its reverse (70202), we get a palindrome (90409).

The spelling of 20207 in words is "twenty thousand, two hundred seven", and thus it is an iban number.