20340434023 has 32 divisors (see below), whose sum is σ = 27362119680. Its totient is φ = 14658209280.

The previous prime is 20340433987. The next prime is 20340434063. The reversal of 20340434023 is 32043404302.

It is not a de Polignac number, because 20340434023 - 2²⁵ = 20306879591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340434063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164113 + ... + 260026.

It is an arithmetic number, because the mean of its divisors is an integer number (855066240).

Almost surely, 2^20340434023 is an apocalyptic number.

20340434023 is a deficient number, since it is larger than the sum of its proper divisors (7021685657).

20340434023 is a wasteful number, since it uses less digits than its factorization.

20340434023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424207.

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 20340434023 its reverse (32043404302), we get a palindrome (52383838325).

It can be divided in two parts, 20 and 340434023, that added together give a palindrome (340434043).

The spelling of 20340434023 in words is "twenty billion, three hundred forty million, four hundred thirty-four thousand, twenty-three".