20796990165 has 160 divisors (see below), whose sum is σ = 43571616000. Its totient is φ = 9293875200.

The previous prime is 20796990157. The next prime is 20796990167. The reversal of 20796990165 is 56109969702.

It is not a de Polignac number, because 20796990165 - 2³ = 20796990157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20796990167) 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 159 ways as a sum of consecutive naturals, for example, 41677086 + ... + 41677584.

It is an arithmetic number, because the mean of its divisors is an integer number (272322600).

Almost surely, 2^20796990165 is an apocalyptic number.

It is an amenable number.

20796990165 is an abundant number, since it is smaller than the sum of its proper divisors (22774625835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20796990165 is a wasteful number, since it uses less digits than its factorization.

20796990165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The spelling of 20796990165 in words is "twenty billion, seven hundred ninety-six million, nine hundred ninety thousand, one hundred sixty-five".