20320637219 has 4 divisors (see below), whose sum is σ = 20321130096. Its totient is φ = 20320144344.

The previous prime is 20320637191. The next prime is 20320637257. The reversal of 20320637219 is 91273602302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320637219 is a prime.

It is a super-2 number, since 2×20320637219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320637119) 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, 178319 + ... + 269144.

It is an arithmetic number, because the mean of its divisors is an integer number (5080282524).

Almost surely, 2^20320637219 is an apocalyptic number.

20320637219 is a deficient number, since it is larger than the sum of its proper divisors (492877).

20320637219 is an equidigital number, since it uses as much as digits as its factorization.

20320637219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492876.

The product of its (nonzero) digits is 27216, while the sum is 35.

The spelling of 20320637219 in words is "twenty billion, three hundred twenty million, six hundred thirty-seven thousand, two hundred nineteen".