20052320251 has 4 divisors (see below), whose sum is σ = 20743779600. Its totient is φ = 19360860904.

The previous prime is 20052320231. The next prime is 20052320279. The reversal of 20052320251 is 15202325002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15202325002 = 2 ⋅7601162501.

It is a cyclic number.

It is not a de Polignac number, because 20052320251 - 2⁵ = 20052320219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20052320231) 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, 345729631 + ... + 345729688.

It is an arithmetic number, because the mean of its divisors is an integer number (5185944900).

Almost surely, 2^20052320251 is an apocalyptic number.

20052320251 is a deficient number, since it is larger than the sum of its proper divisors (691459349).

20052320251 is an equidigital number, since it uses as much as digits as its factorization.

20052320251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691459348.

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 20052320251 its reverse (15202325002), we get a palindrome (35254645253).

The spelling of 20052320251 in words is "twenty billion, fifty-two million, three hundred twenty thousand, two hundred fifty-one".