20548857 has 16 divisors (see below), whose sum is σ = 31456640. Its totient is φ = 11688192.

The previous prime is 20548819. The next prime is 20548859. The reversal of 20548857 is 75884502.

It is not a de Polignac number, because 20548857 - 2²⁴ = 3771641 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20548859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2673 + ... + 6945.

It is an arithmetic number, because the mean of its divisors is an integer number (1966040).

Almost surely, 2^20548857 is an apocalyptic number.

It is an amenable number.

20548857 is a deficient number, since it is larger than the sum of its proper divisors (10907783).

20548857 is a wasteful number, since it uses less digits than its factorization.

20548857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4512.

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 20548857 is about 4533.0847113197. The cubic root of 20548857 is about 273.9024329837.

The spelling of 20548857 in words is "twenty million, five hundred forty-eight thousand, eight hundred fifty-seven".