20512404067 has 4 divisors (see below), whose sum is σ = 20513078856. Its totient is φ = 20511729280.

The previous prime is 20512404053. The next prime is 20512404071. The reversal of 20512404067 is 76040421502.

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

It is a cyclic number.

It is not a de Polignac number, because 20512404067 - 2⁷ = 20512403939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512404007) 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, 289534 + ... + 353347.

It is an arithmetic number, because the mean of its divisors is an integer number (5128269714).

Almost surely, 2^20512404067 is an apocalyptic number.

20512404067 is a deficient number, since it is larger than the sum of its proper divisors (674789).

20512404067 is an equidigital number, since it uses as much as digits as its factorization.

20512404067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674788.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 20512404067 its reverse (76040421502), we get a palindrome (96552825569).

The spelling of 20512404067 in words is "twenty billion, five hundred twelve million, four hundred four thousand, sixty-seven".