20423402111 has 4 divisors (see below), whose sum is σ = 23341030992. Its totient is φ = 17505773232.

The previous prime is 20423402101. The next prime is 20423402141. The reversal of 20423402111 is 11120432402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11120432402 = 2 ⋅5560216201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20423402111 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 (20423402101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1458814430 + ... + 1458814443.

It is an arithmetic number, because the mean of its divisors is an integer number (5835257748).

Almost surely, 2^20423402111 is an apocalyptic number.

20423402111 is a deficient number, since it is larger than the sum of its proper divisors (2917628881).

20423402111 is an equidigital number, since it uses as much as digits as its factorization.

20423402111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917628880.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20423402111 its reverse (11120432402), we get a palindrome (31543834513).

The spelling of 20423402111 in words is "twenty billion, four hundred twenty-three million, four hundred two thousand, one hundred eleven".