20424040111 has 4 divisors (see below), whose sum is σ = 20899017832. Its totient is φ = 19949062392.

The previous prime is 20424040081. The next prime is 20424040121. The reversal of 20424040111 is 11104042402.

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 20424040111 - 2⁷ = 20424039983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424040121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237488796 + ... + 237488881.

It is an arithmetic number, because the mean of its divisors is an integer number (5224754458).

Almost surely, 2^20424040111 is an apocalyptic number.

20424040111 is a deficient number, since it is larger than the sum of its proper divisors (474977721).

20424040111 is an equidigital number, since it uses as much as digits as its factorization.

20424040111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474977720.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20424040111 its reverse (11104042402), we get a palindrome (31528082513).

The spelling of 20424040111 in words is "twenty billion, four hundred twenty-four million, forty thousand, one hundred eleven".