20548591 has 12 divisors (see below), whose sum is σ = 24944112. Its totient is φ = 16846368.

The previous prime is 20548573. The next prime is 20548613. The reversal of 20548591 is 19584502.

It is not a de Polignac number, because 20548591 - 2⁹ = 20548079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20548511) 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, 7990 + ... + 10243.

It is an arithmetic number, because the mean of its divisors is an integer number (2078676).

Almost surely, 2^20548591 is an apocalyptic number.

20548591 is a deficient number, since it is larger than the sum of its proper divisors (4395521).

20548591 is a wasteful number, since it uses less digits than its factorization.

20548591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18270 (or 18263 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 20548591 is about 4533.0553713803. The cubic root of 20548591 is about 273.9012511116.

The spelling of 20548591 in words is "twenty million, five hundred forty-eight thousand, five hundred ninety-one".