20574857 has 4 divisors (see below), whose sum is σ = 21469440. Its totient is φ = 19680276.

The previous prime is 20574823. The next prime is 20574863. The reversal of 20574857 is 75847502.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75847502 = 2 ⋅37923751.

It is a cyclic number.

It is not a de Polignac number, because 20574857 - 2¹² = 20570761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20574857.

It is not an unprimeable number, because it can be changed into a prime (20574817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447257 + ... + 447302.

It is an arithmetic number, because the mean of its divisors is an integer number (5367360).

Almost surely, 2^20574857 is an apocalyptic number.

It is an amenable number.

20574857 is a deficient number, since it is larger than the sum of its proper divisors (894583).

20574857 is an equidigital number, since it uses as much as digits as its factorization.

20574857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894582.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 20574857 is about 4535.9516090893. The cubic root of 20574857 is about 274.0179051293.

The spelling of 20574857 in words is "twenty million, five hundred seventy-four thousand, eight hundred fifty-seven".