20045200521 has 4 divisors (see below), whose sum is σ = 26726934032. Its totient is φ = 13363467012.

The previous prime is 20045200517. The next prime is 20045200523. The reversal of 20045200521 is 12500254002.

It is a happy number.

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 not a de Polignac number, because 20045200521 - 2² = 20045200517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20045200523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3340866751 + ... + 3340866756.

It is an arithmetic number, because the mean of its divisors is an integer number (6681733508).

Almost surely, 2^20045200521 is an apocalyptic number.

It is an amenable number.

20045200521 is a deficient number, since it is larger than the sum of its proper divisors (6681733511).

20045200521 is an equidigital number, since it uses as much as digits as its factorization.

20045200521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6681733510.

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 20045200521 its reverse (12500254002), we get a palindrome (32545454523).

The spelling of 20045200521 in words is "twenty billion, forty-five million, two hundred thousand, five hundred twenty-one".