17982020737 has 4 divisors (see below), whose sum is σ = 17982948676. Its totient is φ = 17981092800.

The previous prime is 17982020713. The next prime is 17982020741. The reversal of 17982020737 is 73702028971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73702028971 = 52321 ⋅1408651.

It can be written as a sum of positive squares in 2 ways, for example, as 5757622641 + 12224398096 = 75879^2 + 110564^2 .

It is a cyclic number.

It is not a de Polignac number, because 17982020737 - 2²³ = 17973632129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17982020437) 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 3 ways as a sum of consecutive naturals, for example, 434268 + ... + 473869.

It is an arithmetic number, because the mean of its divisors is an integer number (4495737169).

Almost surely, 2^17982020737 is an apocalyptic number.

It is an amenable number.

17982020737 is a deficient number, since it is larger than the sum of its proper divisors (927939).

17982020737 is an equidigital number, since it uses as much as digits as its factorization.

17982020737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927938.

The product of its (nonzero) digits is 296352, while the sum is 46.

The spelling of 17982020737 in words is "seventeen billion, nine hundred eighty-two million, twenty thousand, seven hundred thirty-seven".