20564423 has 8 divisors (see below), whose sum is σ = 22517136. Its totient is φ = 18625600.

The previous prime is 20564399. The next prime is 20564431. The reversal of 20564423 is 32446502.

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

It is a cyclic number.

It is not a de Polignac number, because 20564423 - 2⁶ = 20564359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20564392 and 20564401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564473) 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, 236 + ... + 6417.

It is an arithmetic number, because the mean of its divisors is an integer number (2814642).

Almost surely, 2^20564423 is an apocalyptic number.

20564423 is a deficient number, since it is larger than the sum of its proper divisors (1952713).

20564423 is a wasteful number, since it uses less digits than its factorization.

20564423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20564423 is about 4534.8013186908. The cubic root of 20564423 is about 273.9715769618.

The spelling of 20564423 in words is "twenty million, five hundred sixty-four thousand, four hundred twenty-three".