20036564165 has 32 divisors (see below), whose sum is σ = 24691500000. Its totient is φ = 15603793920.

The previous prime is 20036564129. The next prime is 20036564173. The reversal of 20036564165 is 56146563002.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 15526904449 + 4509659716 = 124607^2 + 67154^2 .

It is not a de Polignac number, because 20036564165 - 2⁸ = 20036563909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16041461 + ... + 16042709.

It is an arithmetic number, because the mean of its divisors is an integer number (771609375).

Almost surely, 2^20036564165 is an apocalyptic number.

It is an amenable number.

20036564165 is a deficient number, since it is larger than the sum of its proper divisors (4654935835).

20036564165 is a wasteful number, since it uses less digits than its factorization.

20036564165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 20036564165 in words is "twenty billion, thirty-six million, five hundred sixty-four thousand, one hundred sixty-five".