20806565738 has 32 divisors (see below), whose sum is σ = 35922991104. Its totient is φ = 8853575472.

The previous prime is 20806565737. The next prime is 20806565743. The reversal of 20806565738 is 83756560802.

It is not an unprimeable number, because it can be changed into a prime (20806565737) 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, 2256245 + ... + 2265447.

It is an arithmetic number, because the mean of its divisors is an integer number (1122593472).

Almost surely, 2^20806565738 is an apocalyptic number.

20806565738 is a deficient number, since it is larger than the sum of its proper divisors (15116425366).

20806565738 is a wasteful number, since it uses less digits than its factorization.

20806565738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10346.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 20806565738 in words is "twenty billion, eight hundred six million, five hundred sixty-five thousand, seven hundred thirty-eight".