20564715737 has 16 divisors (see below), whose sum is σ = 22492173312. Its totient is φ = 18717864960.

The previous prime is 20564715719. The next prime is 20564715749. The reversal of 20564715737 is 73751746502.

It is a happy number.

It is not a de Polignac number, because 20564715737 - 2¹² = 20564711641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20564715691 and 20564715700.

It is not an unprimeable number, because it can be changed into a prime (20564715757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805868 + ... + 830994.

It is an arithmetic number, because the mean of its divisors is an integer number (1405760832).

Almost surely, 2^20564715737 is an apocalyptic number.

It is an amenable number.

20564715737 is a deficient number, since it is larger than the sum of its proper divisors (1927457575).

20564715737 is a wasteful number, since it uses less digits than its factorization.

20564715737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26728.

The product of its (nonzero) digits is 1234800, while the sum is 47.

The spelling of 20564715737 in words is "twenty billion, five hundred sixty-four million, seven hundred fifteen thousand, seven hundred thirty-seven".