20336721889 has 4 divisors (see below), whose sum is σ = 22185514800. Its totient is φ = 18487928980.

The previous prime is 20336721883. The next prime is 20336721893. The reversal of 20336721889 is 98812763302.

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 20336721889 - 2²⁵ = 20303167457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20336721883) 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, 924396439 + ... + 924396460.

It is an arithmetic number, because the mean of its divisors is an integer number (5546378700).

Almost surely, 2^20336721889 is an apocalyptic number.

It is an amenable number.

20336721889 is a deficient number, since it is larger than the sum of its proper divisors (1848792911).

20336721889 is a wasteful number, since it uses less digits than its factorization.

20336721889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848792910.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 20336721889 in words is "twenty billion, three hundred thirty-six million, seven hundred twenty-one thousand, eight hundred eighty-nine".