20320121 has 4 divisors (see below), whose sum is σ = 20752512. Its totient is φ = 19887732.

The previous prime is 20320103. The next prime is 20320171. The reversal of 20320121 is 12102302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20320121 - 2⁶ = 20320057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320171) 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, 216125 + ... + 216218.

It is an arithmetic number, because the mean of its divisors is an integer number (5188128).

Almost surely, 2^20320121 is an apocalyptic number.

It is an amenable number.

20320121 is a deficient number, since it is larger than the sum of its proper divisors (432391).

20320121 is an equidigital number, since it uses as much as digits as its factorization.

20320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432390.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20320121 is about 4507.7844890811. The cubic root of 20320121 is about 272.8823395967.

Adding to 20320121 its reverse (12102302), we get a palindrome (32422423).

The spelling of 20320121 in words is "twenty million, three hundred twenty thousand, one hundred twenty-one".