20465091 has 12 divisors (see below), whose sum is σ = 29823768. Its totient is φ = 13521984.

The previous prime is 20465057. The next prime is 20465099. The reversal of 20465091 is 19056402.

20465091 is a `hidden beast` number, since 2 + 0 + 4 + 650 + 9 + 1 = 666.

It is not a de Polignac number, because 20465091 - 2¹¹ = 20463043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20465099) 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 11 ways as a sum of consecutive naturals, for example, 9045 + ... + 11078.

It is an arithmetic number, because the mean of its divisors is an integer number (2485314).

Almost surely, 2^20465091 is an apocalyptic number.

20465091 is a deficient number, since it is larger than the sum of its proper divisors (9358677).

20465091 is a wasteful number, since it uses less digits than its factorization.

20465091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20242 (or 20239 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20465091 is about 4523.8358723543. The cubic root of 20465091 is about 273.5297446447.

The spelling of 20465091 in words is "twenty million, four hundred sixty-five thousand, ninety-one".