20509053 has 4 divisors (see below), whose sum is σ = 27345408. Its totient is φ = 13672700.

The previous prime is 20508997. The next prime is 20509057. The reversal of 20509053 is 35090502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20509053 - 2⁹ = 20508541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20509057) 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, 3418173 + ... + 3418178.

It is an arithmetic number, because the mean of its divisors is an integer number (6836352).

Almost surely, 2^20509053 is an apocalyptic number.

It is an amenable number.

20509053 is a deficient number, since it is larger than the sum of its proper divisors (6836355).

20509053 is an equidigital number, since it uses as much as digits as its factorization.

20509053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6836354.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 20509053 is about 4528.6921953253. The cubic root of 20509053 is about 273.7254651600.

Adding to 20509053 its reverse (35090502), we get a palindrome (55599555).

The spelling of 20509053 in words is "twenty million, five hundred nine thousand, fifty-three".