20802088917 has 6 divisors (see below), whose sum is σ = 30047461782. Its totient is φ = 13868059272.

The previous prime is 20802088907. The next prime is 20802088949. The reversal of 20802088917 is 71988020802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20496503556 + 305585361 = 143166^2 + 17481^2 .

It is not a de Polignac number, because 20802088917 - 2¹⁶ = 20802023381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802088907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1155671598 + ... + 1155671615.

It is an arithmetic number, because the mean of its divisors is an integer number (5007910297).

Almost surely, 2^20802088917 is an apocalyptic number.

It is an amenable number.

20802088917 is a deficient number, since it is larger than the sum of its proper divisors (9245372865).

20802088917 is a wasteful number, since it uses less digits than its factorization.

20802088917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311343219 (or 2311343216 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 20802088917 in words is "twenty billion, eight hundred two million, eighty-eight thousand, nine hundred seventeen".