20718371589 has 4 divisors (see below), whose sum is σ = 27624495456. Its totient is φ = 13812247724.

The previous prime is 20718371567. The next prime is 20718371629. The reversal of 20718371589 is 98517381702.

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 a cyclic number.

It is not a de Polignac number, because 20718371589 - 2¹³ = 20718363397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718371539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3453061929 + ... + 3453061934.

It is an arithmetic number, because the mean of its divisors is an integer number (6906123864).

Almost surely, 2^20718371589 is an apocalyptic number.

It is an amenable number.

20718371589 is a deficient number, since it is larger than the sum of its proper divisors (6906123867).

20718371589 is an equidigital number, since it uses as much as digits as its factorization.

20718371589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906123866.

The product of its (nonzero) digits is 846720, while the sum is 51.

The spelling of 20718371589 in words is "twenty billion, seven hundred eighteen million, three hundred seventy-one thousand, five hundred eighty-nine".