20620343165 has 4 divisors (see below), whose sum is σ = 24744411804. Its totient is φ = 16496274528.

The previous prime is 20620343147. The next prime is 20620343179. The reversal of 20620343165 is 56134302602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3749970169 + 16870372996 = 61237^2 + 129886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620343165 - 2⁸ = 20620342909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062034312 + ... + 2062034321.

It is an arithmetic number, because the mean of its divisors is an integer number (6186102951).

Almost surely, 2^20620343165 is an apocalyptic number.

It is an amenable number.

20620343165 is a deficient number, since it is larger than the sum of its proper divisors (4124068639).

20620343165 is an equidigital number, since it uses as much as digits as its factorization.

20620343165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124068638.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 20620343165 its reverse (56134302602), we get a palindrome (76754645767).

The spelling of 20620343165 in words is "twenty billion, six hundred twenty million, three hundred forty-three thousand, one hundred sixty-five".