20851069312 has 16 divisors (see below), whose sum is σ = 41539239900. Its totient is φ = 10425534592.

The previous prime is 20851069303. The next prime is 20851069333. The reversal of 20851069312 is 21396015802.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81449362 + ... + 81449617.

Almost surely, 2^20851069312 is an apocalyptic number.

It is an amenable number.

20851069312 is a deficient number, since it is larger than the sum of its proper divisors (20688170588).

20851069312 is an equidigital number, since it uses as much as digits as its factorization.

20851069312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162898993 (or 162898981 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 20851069312 in words is "twenty billion, eight hundred fifty-one million, sixty-nine thousand, three hundred twelve".