20385856699 has 12 divisors (see below), whose sum is σ = 22104157152. Its totient is φ = 18792540000.

The previous prime is 20385856681. The next prime is 20385856723. The reversal of 20385856699 is 99665858302.

It is a de Polignac number, because none of the positive numbers 2^k-20385856699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20385856619) 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 in 11 ways as a sum of consecutive naturals, for example, 46609 + ... + 207229.

It is an arithmetic number, because the mean of its divisors is an integer number (1842013096).

Almost surely, 2^20385856699 is an apocalyptic number.

20385856699 is a deficient number, since it is larger than the sum of its proper divisors (1718300453).

20385856699 is a wasteful number, since it uses less digits than its factorization.

20385856699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161398 (or 161385 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 61.

The spelling of 20385856699 in words is "twenty billion, three hundred eighty-five million, eight hundred fifty-six thousand, six hundred ninety-nine".