20564355135 has 16 divisors (see below), whose sum is σ = 33353695584. Its totient is φ = 10817413632.

The previous prime is 20564355107. The next prime is 20564355143. The reversal of 20564355135 is 53155346502.

It is not a de Polignac number, because 20564355135 - 2⁵ = 20564355103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20564355093 and 20564355102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9389022 + ... + 9391211.

It is an arithmetic number, because the mean of its divisors is an integer number (2084605974).

Almost surely, 2^20564355135 is an apocalyptic number.

20564355135 is a deficient number, since it is larger than the sum of its proper divisors (12789340449).

20564355135 is a wasteful number, since it uses less digits than its factorization.

20564355135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18780314.

The product of its (nonzero) digits is 270000, while the sum is 39.

The spelling of 20564355135 in words is "twenty billion, five hundred sixty-four million, three hundred fifty-five thousand, one hundred thirty-five".