20625123 has 4 divisors (see below), whose sum is σ = 27500168. Its totient is φ = 13750080.

The previous prime is 20625113. The next prime is 20625139. The reversal of 20625123 is 32152602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20625123 - 2⁴ = 20625107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20625123.

It is not an unprimeable number, because it can be changed into a prime (20625103) 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, 3437518 + ... + 3437523.

It is an arithmetic number, because the mean of its divisors is an integer number (6875042).

Almost surely, 2^20625123 is an apocalyptic number.

20625123 is a deficient number, since it is larger than the sum of its proper divisors (6875045).

20625123 is an equidigital number, since it uses as much as digits as its factorization.

20625123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875044.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20625123 is about 4541.4890729804. The cubic root of 20625123 is about 274.2408727771.

Adding to 20625123 its reverse (32152602), we get a palindrome (52777725).

The spelling of 20625123 in words is "twenty million, six hundred twenty-five thousand, one hundred twenty-three".