20718845733 has 4 divisors (see below), whose sum is σ = 27625127648. Its totient is φ = 13812563820.

The previous prime is 20718845731. The next prime is 20718845737. The reversal of 20718845733 is 33754881702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20718845733 - 2¹ = 20718845731 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718845731) 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, 3453140953 + ... + 3453140958.

It is an arithmetic number, because the mean of its divisors is an integer number (6906281912).

Almost surely, 2^20718845733 is an apocalyptic number.

It is an amenable number.

20718845733 is a deficient number, since it is larger than the sum of its proper divisors (6906281915).

20718845733 is an equidigital number, since it uses as much as digits as its factorization.

20718845733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906281914.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 20718845733 in words is "twenty billion, seven hundred eighteen million, eight hundred forty-five thousand, seven hundred thirty-three".