20125123 has 4 divisors (see below), whose sum is σ = 21184360. Its totient is φ = 19065888.

The previous prime is 20125117. The next prime is 20125153. The reversal of 20125123 is 32152102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32152102 = 2 ⋅16076051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20125097 and 20125106.

It is not an unprimeable number, because it can be changed into a prime (20125103) 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, 529590 + ... + 529627.

It is an arithmetic number, because the mean of its divisors is an integer number (5296090).

Almost surely, 2^20125123 is an apocalyptic number.

20125123 is a deficient number, since it is larger than the sum of its proper divisors (1059237).

20125123 is a wasteful number, since it uses less digits than its factorization.

20125123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059236.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20125123 is about 4486.1033202547. The cubic root of 20125123 is about 272.0066454187.

Adding to 20125123 its reverse (32152102), we get a palindrome (52277225).

The spelling of 20125123 in words is "twenty million, one hundred twenty-five thousand, one hundred twenty-three".