20522450291 has 4 divisors (see below), whose sum is σ = 23454228912. Its totient is φ = 17590671672.

The previous prime is 20522450233. The next prime is 20522450357. The reversal of 20522450291 is 19205422502.

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

It is not a de Polignac number, because 20522450291 - 2²⁶ = 20455341427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20522450231) 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, 1465889300 + ... + 1465889313.

It is an arithmetic number, because the mean of its divisors is an integer number (5863557228).

Almost surely, 2^20522450291 is an apocalyptic number.

20522450291 is a deficient number, since it is larger than the sum of its proper divisors (2931778621).

20522450291 is an equidigital number, since it uses as much as digits as its factorization.

20522450291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931778620.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 20522450291 its reverse (19205422502), we get a palindrome (39727872793).

The spelling of 20522450291 in words is "twenty billion, five hundred twenty-two million, four hundred fifty thousand, two hundred ninety-one".