20434511023 has 4 divisors (see below), whose sum is σ = 21322968048. Its totient is φ = 19546054000.

The previous prime is 20434511017. The next prime is 20434511113. The reversal of 20434511023 is 32011543402.

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 20434511023 - 2⁹ = 20434510511 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 (20434511623) 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, 444228478 + ... + 444228523.

It is an arithmetic number, because the mean of its divisors is an integer number (5330742012).

Almost surely, 2^20434511023 is an apocalyptic number.

20434511023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20434511023 is a deficient number, since it is larger than the sum of its proper divisors (888457025).

20434511023 is an equidigital number, since it uses as much as digits as its factorization.

20434511023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888457024.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 20434511023 in words is "twenty billion, four hundred thirty-four million, five hundred eleven thousand, twenty-three".