20423111211 has 48 divisors (see below), whose sum is σ = 32652232704. Its totient is φ = 12235229952.

The previous prime is 20423111171. The next prime is 20423111239. The reversal of 20423111211 is 11211132402.

20423111211 is a `hidden beast` number, since 20 + 423 + 1 + 11 + 211 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20423111211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20423111281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2060710 + ... + 2070596.

It is an arithmetic number, because the mean of its divisors is an integer number (680254848).

Almost surely, 2^20423111211 is an apocalyptic number.

20423111211 is a deficient number, since it is larger than the sum of its proper divisors (12229121493).

20423111211 is a wasteful number, since it uses less digits than its factorization.

20423111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10520 (or 10517 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20423111211 its reverse (11211132402), we get a palindrome (31634243613).

The spelling of 20423111211 in words is "twenty billion, four hundred twenty-three million, one hundred eleven thousand, two hundred eleven".