20385518361 has 48 divisors (see below), whose sum is σ = 32050180800. Its totient is φ = 11474701056.

The previous prime is 20385518357. The next prime is 20385518371. The reversal of 20385518361 is 16381558302.

It is not a de Polignac number, because 20385518361 - 2² = 20385518357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20385518371) 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 47 ways as a sum of consecutive naturals, for example, 242871 + ... + 315843.

It is an arithmetic number, because the mean of its divisors is an integer number (667712100).

Almost surely, 2^20385518361 is an apocalyptic number.

It is an amenable number.

20385518361 is a deficient number, since it is larger than the sum of its proper divisors (11664662439).

20385518361 is a wasteful number, since it uses less digits than its factorization.

20385518361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73050 (or 73037 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 20385518361 in words is "twenty billion, three hundred eighty-five million, five hundred eighteen thousand, three hundred sixty-one".