20023132123 has 4 divisors (see below), whose sum is σ = 20217531568. Its totient is φ = 19828732680.

The previous prime is 20023132091. The next prime is 20023132127. The reversal of 20023132123 is 32123132002.

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 20023132123 - 2⁵ = 20023132091 is a prime.

It is a super-2 number, since 2×20023132123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20023132123.

It is not an unprimeable number, because it can be changed into a prime (20023132127) 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, 97199568 + ... + 97199773.

It is an arithmetic number, because the mean of its divisors is an integer number (5054382892).

Almost surely, 2^20023132123 is an apocalyptic number.

20023132123 is a deficient number, since it is larger than the sum of its proper divisors (194399445).

20023132123 is a wasteful number, since it uses less digits than its factorization.

20023132123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194399444.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20023132123 its reverse (32123132002), we get a palindrome (52146264125).

The spelling of 20023132123 in words is "twenty billion, twenty-three million, one hundred thirty-two thousand, one hundred twenty-three".