20545073 has 4 divisors (see below), whose sum is σ = 20792688. Its totient is φ = 20297460.

The previous prime is 20545051. The next prime is 20545097. The reversal of 20545073 is 37054502.

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 20545073 - 2⁸ = 20544817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545573) 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, 123683 + ... + 123848.

It is an arithmetic number, because the mean of its divisors is an integer number (5198172).

Almost surely, 2^20545073 is an apocalyptic number.

It is an amenable number.

20545073 is a deficient number, since it is larger than the sum of its proper divisors (247615).

20545073 is an equidigital number, since it uses as much as digits as its factorization.

20545073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247614.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20545073 is about 4532.6673162720. The cubic root of 20545073 is about 273.8856192272.

Adding to 20545073 its reverse (37054502), we get a palindrome (57599575).

The spelling of 20545073 in words is "twenty million, five hundred forty-five thousand, seventy-three".