20051992803968 has 16 divisors (see below), whose sum is σ = 39947329414410. Its totient is φ = 10025996401920.

The previous prime is 20051992803943. The next prime is 20051992803977. The reversal of 20051992803968 is 86930829915002.

It can be written as a sum of positive squares in only one way, i.e., 11900236907584 + 8151755896384 = 3449672^2 + 2855128^2 .

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

It is a super-3 number, since 3×20051992803968³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20051992803968.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78328096763 + ... + 78328097018.

Almost surely, 2^{20051992803968} is an apocalyptic number.

It is an amenable number.

20051992803968 is a deficient number, since it is larger than the sum of its proper divisors (19895336610442).

20051992803968 is an equidigital number, since it uses as much as digits as its factorization.

20051992803968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156656193795 (or 156656193783 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 62.

The spelling of 20051992803968 in words is "twenty trillion, fifty-one billion, nine hundred ninety-two million, eight hundred three thousand, nine hundred sixty-eight".