20123321 has 8 divisors (see below), whose sum is σ = 21056640. Its totient is φ = 19194912.

The previous prime is 20123293. The next prime is 20123339. The reversal of 20123321 is 12332102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123296 and 20123305.

It is not an unprimeable number, because it can be changed into a prime (20123381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9101 + ... + 11093.

It is an arithmetic number, because the mean of its divisors is an integer number (2632080).

Almost surely, 2^20123321 is an apocalyptic number.

It is an amenable number.

20123321 is a deficient number, since it is larger than the sum of its proper divisors (933319).

20123321 is a wasteful number, since it uses less digits than its factorization.

20123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455.

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

The square root of 20123321 is about 4485.9024733046. The cubic root of 20123321 is about 271.9985267005.

Adding to 20123321 its reverse (12332102), we get a palindrome (32455423).

The spelling of 20123321 in words is "twenty million, one hundred twenty-three thousand, three hundred twenty-one".