20875123 has 4 divisors (see below), whose sum is σ = 21186760. Its totient is φ = 20563488.

The previous prime is 20875111. The next prime is 20875139. The reversal of 20875123 is 32157802.

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 20875123 - 2⁹ = 20874611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20875091 and 20875100.

It is not an unprimeable number, because it can be changed into a prime (20875103) 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, 155718 + ... + 155851.

It is an arithmetic number, because the mean of its divisors is an integer number (5296690).

Almost surely, 2^20875123 is an apocalyptic number.

20875123 is a deficient number, since it is larger than the sum of its proper divisors (311637).

20875123 is an equidigital number, since it uses as much as digits as its factorization.

20875123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311636.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20875123 is about 4568.9301811256. The cubic root of 20875123 is about 275.3444631136.

The spelling of 20875123 in words is "twenty million, eight hundred seventy-five thousand, one hundred twenty-three".