20325681 has 8 divisors (see below), whose sum is σ = 30112160. Its totient is φ = 13550436.

The previous prime is 20325653. The next prime is 20325707. The reversal of 20325681 is 18652302.

It is not a de Polignac number, because 20325681 - 2¹⁰ = 20324657 is a prime.

It is a super-2 number, since 2×20325681² = 826266616227522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 752803 = 20325681 / (2 + 0 + 3 + 2 + 5 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20325581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376375 + ... + 376428.

It is an arithmetic number, because the mean of its divisors is an integer number (3764020).

Almost surely, 2^20325681 is an apocalyptic number.

It is an amenable number.

20325681 is a deficient number, since it is larger than the sum of its proper divisors (9786479).

20325681 is an equidigital number, since it uses as much as digits as its factorization.

20325681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752812 (or 752806 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20325681 is about 4508.4011578386. The cubic root of 20325681 is about 272.9072260537.

Adding to 20325681 its reverse (18652302), we get a palindrome (38977983).

The spelling of 20325681 in words is "twenty million, three hundred twenty-five thousand, six hundred eighty-one".