20340440111 has 4 divisors (see below), whose sum is σ = 20416055400. Its totient is φ = 20264824824.

The previous prime is 20340440083. The next prime is 20340440173. The reversal of 20340440111 is 11104404302.

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 20340440111 - 2¹⁸ = 20340177967 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 (20340440411) 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, 37807241 + ... + 37807778.

It is an arithmetic number, because the mean of its divisors is an integer number (5104013850).

Almost surely, 2^20340440111 is an apocalyptic number.

20340440111 is a deficient number, since it is larger than the sum of its proper divisors (75615289).

20340440111 is an equidigital number, since it uses as much as digits as its factorization.

20340440111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75615288.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20340440111 its reverse (11104404302), we get a palindrome (31444844413).

The spelling of 20340440111 in words is "twenty billion, three hundred forty million, four hundred forty thousand, one hundred eleven".