20564435 has 4 divisors (see below), whose sum is σ = 24677328. Its totient is φ = 16451544.

The previous prime is 20564431. The next prime is 20564459. The reversal of 20564435 is 53446502.

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 20564435 - 2² = 20564431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20564398 and 20564407.

It is not an unprimeable number, because it can be changed into a prime (20564431) 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, 2056439 + ... + 2056448.

It is an arithmetic number, because the mean of its divisors is an integer number (6169332).

Almost surely, 2^20564435 is an apocalyptic number.

20564435 is a deficient number, since it is larger than the sum of its proper divisors (4112893).

20564435 is an equidigital number, since it uses as much as digits as its factorization.

20564435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112892.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 20564435 is about 4534.8026417916. The cubic root of 20564435 is about 273.9716302522.

The spelling of 20564435 in words is "twenty million, five hundred sixty-four thousand, four hundred thirty-five".