20564623 has 2 divisors, whose sum is σ = 20564624. Its totient is φ = 20564622.

The previous prime is 20564603. The next prime is 20564639. The reversal of 20564623 is 32646502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20564623 - 2⁵ = 20564591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20564591 and 20564600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20564603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282311 + 10282312.

It is an arithmetic number, because the mean of its divisors is an integer number (10282312).

Almost surely, 2^20564623 is an apocalyptic number.

20564623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20564623 is an equidigital number, since it uses as much as digits as its factorization.

20564623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20564623 is about 4534.8233703200. The cubic root of 20564623 is about 273.9724651322.

The spelling of 20564623 in words is "twenty million, five hundred sixty-four thousand, six hundred twenty-three".