20564043 has 4 divisors (see below), whose sum is σ = 27418728. Its totient is φ = 13709360.

The previous prime is 20564041. The next prime is 20564059. The reversal of 20564043 is 34046502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20564043 - 2¹ = 20564041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20564041) 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, 3427338 + ... + 3427343.

It is an arithmetic number, because the mean of its divisors is an integer number (6854682).

Almost surely, 2^20564043 is an apocalyptic number.

20564043 is a deficient number, since it is larger than the sum of its proper divisors (6854685).

20564043 is an equidigital number, since it uses as much as digits as its factorization.

20564043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854684.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20564043 is about 4534.7594203000. The cubic root of 20564043 is about 273.9698894221.

The spelling of 20564043 in words is "twenty million, five hundred sixty-four thousand, forty-three".