20842089 has 4 divisors (see below), whose sum is σ = 27789456. Its totient is φ = 13894724.

The previous prime is 20842049. The next prime is 20842093. The reversal of 20842089 is 98024802.

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 20842089 - 2⁹ = 20841577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20842049) 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, 3473679 + ... + 3473684.

It is an arithmetic number, because the mean of its divisors is an integer number (6947364).

Almost surely, 2^20842089 is an apocalyptic number.

It is an amenable number.

20842089 is a deficient number, since it is larger than the sum of its proper divisors (6947367).

20842089 is an equidigital number, since it uses as much as digits as its factorization.

20842089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6947366.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20842089 is about 4565.3136803510. The cubic root of 20842089 is about 275.1991461081.

The spelling of 20842089 in words is "twenty million, eight hundred forty-two thousand, eighty-nine".