20205051 has 4 divisors (see below), whose sum is σ = 26940072. Its totient is φ = 13470032.

The previous prime is 20205041. The next prime is 20205077. The reversal of 20205051 is 15050202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20205051 - 2¹⁰ = 20204027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20205051.

It is not an unprimeable number, because it can be changed into a prime (20205001) 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, 3367506 + ... + 3367511.

It is an arithmetic number, because the mean of its divisors is an integer number (6735018).

Almost surely, 2^20205051 is an apocalyptic number.

20205051 is a deficient number, since it is larger than the sum of its proper divisors (6735021).

20205051 is an equidigital number, since it uses as much as digits as its factorization.

20205051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735020.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 20205051 is about 4495.0028921014. The cubic root of 20205051 is about 272.3662660566.

Adding to 20205051 its reverse (15050202), we get a palindrome (35255253).

The spelling of 20205051 in words is "twenty million, two hundred five thousand, fifty-one".