20564031 has 4 divisors (see below), whose sum is σ = 27418712. Its totient is φ = 13709352.

The previous prime is 20564021. The next prime is 20564039. The reversal of 20564031 is 13046502.

It is a happy number.

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

It is not a de Polignac number, because 20564031 - 2⁹ = 20563519 is a prime.

It is a super-2 number, since 2×20564031² = 845758741937922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20563989 and 20564007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564039) 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, 3427336 + ... + 3427341.

It is an arithmetic number, because the mean of its divisors is an integer number (6854678).

Almost surely, 2^20564031 is an apocalyptic number.

20564031 is a deficient number, since it is larger than the sum of its proper divisors (6854681).

20564031 is an equidigital number, since it uses as much as digits as its factorization.

20564031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854680.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20564031 is about 4534.7580971867. The cubic root of 20564031 is about 273.9698361310.

The spelling of 20564031 in words is "twenty million, five hundred sixty-four thousand, thirty-one".