20641089 has 8 divisors (see below), whose sum is σ = 31453120. Its totient is φ = 11794896.

The previous prime is 20641073. The next prime is 20641099. The reversal of 20641089 is 98014602.

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

It is not a de Polignac number, because 20641089 - 2⁴ = 20641073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20641039) 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, 491434 + ... + 491475.

It is an arithmetic number, because the mean of its divisors is an integer number (3931640).

Almost surely, 2^20641089 is an apocalyptic number.

It is an amenable number.

20641089 is a deficient number, since it is larger than the sum of its proper divisors (10812031).

20641089 is an equidigital number, since it uses as much as digits as its factorization.

20641089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982919.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20641089 is about 4543.2465264390. The cubic root of 20641089 is about 274.3116182210.

The spelling of 20641089 in words is "twenty million, six hundred forty-one thousand, eighty-nine".