20564135 has 8 divisors (see below), whose sum is σ = 26128656. Its totient is φ = 15483520.

The previous prime is 20564123. The next prime is 20564147. The reversal of 20564135 is 53146502.

It is an interprime number because it is at equal distance from previous prime (20564123) and next prime (20564147).

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

It is not a de Polignac number, because 20564135 - 2¹² = 20560039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120881 + ... + 121050.

It is an arithmetic number, because the mean of its divisors is an integer number (3266082).

Almost surely, 2^20564135 is an apocalyptic number.

20564135 is a deficient number, since it is larger than the sum of its proper divisors (5564521).

20564135 is a wasteful number, since it uses less digits than its factorization.

20564135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241953.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20564135 is about 4534.7695641565. The cubic root of 20564135 is about 273.9702979863.

The spelling of 20564135 in words is "twenty million, five hundred sixty-four thousand, one hundred thirty-five".