20104009165 has 16 divisors (see below), whose sum is σ = 25418135808. Its totient is φ = 15234569856.

The previous prime is 20104009111. The next prime is 20104009169. The reversal of 20104009165 is 56190040102.

It is a cyclic number.

It is not a de Polignac number, because 20104009165 - 2³³ = 11514074573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104009169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 836784 + ... + 860473.

It is an arithmetic number, because the mean of its divisors is an integer number (1588633488).

Almost surely, 2^20104009165 is an apocalyptic number.

It is an amenable number.

20104009165 is a deficient number, since it is larger than the sum of its proper divisors (5314126643).

20104009165 is a wasteful number, since it uses less digits than its factorization.

20104009165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697388.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 20104009165 its reverse (56190040102), we get a palindrome (76294049267).

The spelling of 20104009165 in words is "twenty billion, one hundred four million, nine thousand, one hundred sixty-five".