20564331 has 8 divisors (see below), whose sum is σ = 27594384. Its totient is φ = 13621920.

The previous prime is 20564321. The next prime is 20564359. The reversal of 20564331 is 13346502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20564331 - 2¹⁰ = 20563307 is a prime.

It is a super-2 number, since 2×20564331² = 845783418955122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20564321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21360 + ... + 22301.

It is an arithmetic number, because the mean of its divisors is an integer number (3449298).

Almost surely, 2^20564331 is an apocalyptic number.

20564331 is a deficient number, since it is larger than the sum of its proper divisors (7030053).

20564331 is a wasteful number, since it uses less digits than its factorization.

20564331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43821.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20564331 is about 4534.7911749054. The cubic root of 20564331 is about 273.9711684015.

Adding to 20564331 its product of nonzero digits (2160), we get a triangular number (20566491 = T₆₄₁₃).

The spelling of 20564331 in words is "twenty million, five hundred sixty-four thousand, three hundred thirty-one".