20715120194 has 16 divisors (see below), whose sum is σ = 33702938136. Its totient is φ = 9510528000.

The previous prime is 20715120191. The next prime is 20715120199. The reversal of 20715120194 is 49102151702.

It can be written as a sum of positive squares in 4 ways, for example, as 19848583225 + 866536969 = 140885^2 + 29437^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20715120194.

It is not an unprimeable number, because it can be changed into a prime (20715120191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7428707 + ... + 7431494.

Almost surely, 2^20715120194 is an apocalyptic number.

20715120194 is a deficient number, since it is larger than the sum of its proper divisors (12987817942).

20715120194 is a wasteful number, since it uses less digits than its factorization.

20715120194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14860261.

The product of its (nonzero) digits is 5040, while the sum is 32.

Adding to 20715120194 its reverse (49102151702), we get a palindrome (69817271896).

The spelling of 20715120194 in words is "twenty billion, seven hundred fifteen million, one hundred twenty thousand, one hundred ninety-four".