20115123 has 16 divisors (see below), whose sum is σ = 30790656. Its totient is φ = 11442240.

The previous prime is 20115113. The next prime is 20115127. The reversal of 20115123 is 32151102.

It is not a de Polignac number, because 20115123 - 2¹⁰ = 20114099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20115127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2838 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (1924416).

Almost surely, 2^20115123 is an apocalyptic number.

20115123 is a deficient number, since it is larger than the sum of its proper divisors (10675533).

20115123 is a wasteful number, since it uses less digits than its factorization.

20115123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20115123 is about 4484.9886287481. The cubic root of 20115123 is about 271.9615853694.

Adding to 20115123 its reverse (32151102), we get a palindrome (52266225).

The spelling of 20115123 in words is "twenty million, one hundred fifteen thousand, one hundred twenty-three".