20665327837 has 16 divisors (see below), whose sum is σ = 25777469952. Its totient is φ = 16094787120.

The previous prime is 20665327757. The next prime is 20665327871. The reversal of 20665327837 is 73872356602.

It is a cyclic number.

It is not a de Polignac number, because 20665327837 - 2²⁷ = 20531110109 is a prime.

It is a super-2 number, since 2×20665327837² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665327897) 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 15 ways as a sum of consecutive naturals, for example, 89878 + ... + 222280.

It is an arithmetic number, because the mean of its divisors is an integer number (1611091872).

Almost surely, 2^20665327837 is an apocalyptic number.

It is an amenable number.

20665327837 is a deficient number, since it is larger than the sum of its proper divisors (5112142115).

20665327837 is a wasteful number, since it uses less digits than its factorization.

20665327837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134448.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 20665327837 in words is "twenty billion, six hundred sixty-five million, three hundred twenty-seven thousand, eight hundred thirty-seven".