20566873 has 4 divisors (see below), whose sum is σ = 21649360. Its totient is φ = 19484388.

The previous prime is 20566867. The next prime is 20566877. The reversal of 20566873 is 37866502.

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.

It is a cyclic number.

It is not a de Polignac number, because 20566873 - 2⁵ = 20566841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20566877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541215 + ... + 541252.

It is an arithmetic number, because the mean of its divisors is an integer number (5412340).

Almost surely, 2^20566873 is an apocalyptic number.

It is an amenable number.

20566873 is a deficient number, since it is larger than the sum of its proper divisors (1082487).

20566873 is a wasteful number, since it uses less digits than its factorization.

20566873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082486.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20566873 is about 4535.0714437592. The cubic root of 20566873 is about 273.9824566529.

The spelling of 20566873 in words is "twenty million, five hundred sixty-six thousand, eight hundred seventy-three".