20110123 has 4 divisors (see below), whose sum is σ = 21938328. Its totient is φ = 18281920.

The previous prime is 20110109. The next prime is 20110141. The reversal of 20110123 is 32101102.

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 20110123 - 2²¹ = 18012971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110183) 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, 914086 + ... + 914107.

It is an arithmetic number, because the mean of its divisors is an integer number (5484582).

Almost surely, 2^20110123 is an apocalyptic number.

20110123 is a deficient number, since it is larger than the sum of its proper divisors (1828205).

20110123 is a wasteful number, since it uses less digits than its factorization.

20110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828204.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20110123 is about 4484.4311790906. The cubic root of 20110123 is about 271.9390497443.

Adding to 20110123 its reverse (32101102), we get a palindrome (52211225).

It can be divided in two parts, 2011012 and 3, that added together give a triangular number (2011015 = T₂₀₀₅).

The spelling of 20110123 in words is "twenty million, one hundred ten thousand, one hundred twenty-three".