20423120432111 has 4 divisors (see below), whose sum is σ = 20423258314800. Its totient is φ = 20422982549424.

The previous prime is 20423120432107. The next prime is 20423120432171. The reversal of 20423120432111 is 11123402132402.

It is a happy number.

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 20423120432111 - 2² = 20423120432107 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 (20423120432171) 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, 68718926 + ... + 69015483.

It is an arithmetic number, because the mean of its divisors is an integer number (5105814578700).

Almost surely, 2^{20423120432111} is an apocalyptic number.

20423120432111 is a deficient number, since it is larger than the sum of its proper divisors (137882689).

20423120432111 is a wasteful number, since it uses less digits than its factorization.

20423120432111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137882688.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 20423120432111 its reverse (11123402132402), we get a palindrome (31546522564513).

The spelling of 20423120432111 in words is "twenty trillion, four hundred twenty-three billion, one hundred twenty million, four hundred thirty-two thousand, one hundred eleven".