20423211023 has 4 divisors (see below), whose sum is σ = 20438152560. Its totient is φ = 20408269488.

The previous prime is 20423211019. The next prime is 20423211047. The reversal of 20423211023 is 32011232402.

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 20423211023 - 2² = 20423211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20423210986 and 20423211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423210023) 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, 7468718 + ... + 7471451.

It is an arithmetic number, because the mean of its divisors is an integer number (5109538140).

Almost surely, 2^20423211023 is an apocalyptic number.

20423211023 is a deficient number, since it is larger than the sum of its proper divisors (14941537).

20423211023 is a wasteful number, since it uses less digits than its factorization.

20423211023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14941536.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20423211023 its reverse (32011232402), we get a palindrome (52434443425).

The spelling of 20423211023 in words is "twenty billion, four hundred twenty-three million, two hundred eleven thousand, twenty-three".