20564355145 has 32 divisors (see below), whose sum is σ = 26022850560. Its totient is φ = 15580931520.

The previous prime is 20564355143. The next prime is 20564355157. The reversal of 20564355145 is 54155346502.

It is not a de Polignac number, because 20564355145 - 2¹ = 20564355143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20564355098 and 20564355107.

It is not an unprimeable number, because it can be changed into a prime (20564355143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1369086 + ... + 1384024.

It is an arithmetic number, because the mean of its divisors is an integer number (813214080).

Almost surely, 2^20564355145 is an apocalyptic number.

It is an amenable number.

20564355145 is a deficient number, since it is larger than the sum of its proper divisors (5458495415).

20564355145 is a wasteful number, since it uses less digits than its factorization.

20564355145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15165.

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 20564355145 in words is "twenty billion, five hundred sixty-four million, three hundred fifty-five thousand, one hundred forty-five".