20388192218 has 4 divisors (see below), whose sum is σ = 30582288330. Its totient is φ = 10194096108.

The previous prime is 20388192217. The next prime is 20388192239. The reversal of 20388192218 is 81229188302.

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

It can be written as a sum of positive squares in only one way, i.e., 20091078049 + 297114169 = 141743^2 + 17237^2 .

It is not an unprimeable number, because it can be changed into a prime (20388192217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5097048053 + ... + 5097048056.

Almost surely, 2^20388192218 is an apocalyptic number.

20388192218 is a deficient number, since it is larger than the sum of its proper divisors (10194096112).

20388192218 is a wasteful number, since it uses less digits than its factorization.

20388192218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10194096111.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 20388192218 in words is "twenty billion, three hundred eighty-eight million, one hundred ninety-two thousand, two hundred eighteen".