20578089 has 12 divisors (see below), whose sum is σ = 31917264. Its totient is φ = 11758824.

The previous prime is 20578073. The next prime is 20578093. The reversal of 20578089 is 98087502.

It is not a de Polignac number, because 20578089 - 2⁴ = 20578073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20578009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69847 + ... + 70140.

It is an arithmetic number, because the mean of its divisors is an integer number (2659772).

Almost surely, 2^20578089 is an apocalyptic number.

It is an amenable number.

20578089 is a deficient number, since it is larger than the sum of its proper divisors (11339175).

20578089 is a wasteful number, since it uses less digits than its factorization.

20578089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140004 (or 139997 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 20578089 is about 4536.3078599231. The cubic root of 20578089 is about 274.0322524060.

The spelling of 20578089 in words is "twenty million, five hundred seventy-eight thousand, eighty-nine".