20312123 has 4 divisors (see below), whose sum is σ = 21874608. Its totient is φ = 18749640.

The previous prime is 20312113. The next prime is 20312137. The reversal of 20312123 is 32121302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32121302 = 2 ⋅16060651.

It is not a de Polignac number, because 20312123 - 2¹² = 20308027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312098 and 20312107.

It is not an unprimeable number, because it can be changed into a prime (20312113) 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, 781223 + ... + 781248.

It is an arithmetic number, because the mean of its divisors is an integer number (5468652).

Almost surely, 2^20312123 is an apocalyptic number.

20312123 is a deficient number, since it is larger than the sum of its proper divisors (1562485).

20312123 is a wasteful number, since it uses less digits than its factorization.

20312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562484.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20312123 is about 4506.8972697411. The cubic root of 20312123 is about 272.8465327338.

Adding to 20312123 its reverse (32121302), we get a palindrome (52433425).

The spelling of 20312123 in words is "twenty million, three hundred twelve thousand, one hundred twenty-three".