20111223023 has 32 divisors (see below), whose sum is σ = 22821004800. Its totient is φ = 17679919488.

The previous prime is 20111223019. The next prime is 20111223043. The reversal of 20111223023 is 32032211102.

It is not a de Polignac number, because 20111223023 - 2² = 20111223019 is a prime.

It is a super-2 number, since 2×20111223023² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 20111222992 and 20111223010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111223043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4856888 + ... + 4861026.

It is an arithmetic number, because the mean of its divisors is an integer number (713156400).

Almost surely, 2^20111223023 is an apocalyptic number.

20111223023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20111223023 is a deficient number, since it is larger than the sum of its proper divisors (2709781777).

20111223023 is an equidigital number, since it uses as much as digits as its factorization.

20111223023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256 (or 4222 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20111223023 its reverse (32032211102), we get a palindrome (52143434125).

The spelling of 20111223023 in words is "twenty billion, one hundred eleven million, two hundred twenty-three thousand, twenty-three".