20325531 has 4 divisors (see below), whose sum is σ = 27100712. Its totient is φ = 13550352.

The previous prime is 20325527. The next prime is 20325533. The reversal of 20325531 is 13552302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20325531 - 2² = 20325527 is a prime.

It is a super-2 number, since 2×20325531² = 826254420863922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20325498 and 20325507.

It is not an unprimeable number, because it can be changed into a prime (20325533) 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, 3387586 + ... + 3387591.

It is an arithmetic number, because the mean of its divisors is an integer number (6775178).

Almost surely, 2^20325531 is an apocalyptic number.

20325531 is a deficient number, since it is larger than the sum of its proper divisors (6775181).

20325531 is an equidigital number, since it uses as much as digits as its factorization.

20325531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6775180.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 20325531 is about 4508.3845221986. The cubic root of 20325531 is about 272.9065547160.

Adding to 20325531 its reverse (13552302), we get a palindrome (33877833).

The spelling of 20325531 in words is "twenty million, three hundred twenty-five thousand, five hundred thirty-one".