20325021 has 4 divisors (see below), whose sum is σ = 27100032. Its totient is φ = 13550012.

The previous prime is 20324999. The next prime is 20325049. The reversal of 20325021 is 12052302.

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 20325021 - 2⁵ = 20324989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20325061) 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, 3387501 + ... + 3387506.

It is an arithmetic number, because the mean of its divisors is an integer number (6775008).

Almost surely, 2^20325021 is an apocalyptic number.

It is an amenable number.

20325021 is a deficient number, since it is larger than the sum of its proper divisors (6775011).

20325021 is an equidigital number, since it uses as much as digits as its factorization.

20325021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6775010.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20325021 is about 4508.3279605637. The cubic root of 20325021 is about 272.9042721433.

Adding to 20325021 its reverse (12052302), we get a palindrome (32377323).

The spelling of 20325021 in words is "twenty million, three hundred twenty-five thousand, twenty-one".