20326861165 has 24 divisors (see below), whose sum is σ = 26515948968. Its totient is φ = 14952038400.

The previous prime is 20326861147. The next prime is 20326861171. The reversal of 20326861165 is 56116862302.

It can be written as a sum of positive squares in 12 ways, for example, as 881674249 + 19445186916 = 29693^2 + 139446^2 .

It is not a de Polignac number, because 20326861165 - 2²¹ = 20324764013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 170365 + ... + 263965.

It is an arithmetic number, because the mean of its divisors is an integer number (1104831207).

Almost surely, 2^20326861165 is an apocalyptic number.

It is an amenable number.

20326861165 is a deficient number, since it is larger than the sum of its proper divisors (6189087803).

20326861165 is a wasteful number, since it uses less digits than its factorization.

20326861165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93889 (or 93876 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 20326861165 in words is "twenty billion, three hundred twenty-six million, eight hundred sixty-one thousand, one hundred sixty-five".