20864992451797 has 16 divisors (see below), whose sum is σ = 23698021677120. Its totient is φ = 18211287369600.

The previous prime is 20864992451767. The next prime is 20864992451801. The reversal of 20864992451797 is 79715429946802.

It is a de Polignac number, because none of the positive numbers 2^k-20864992451797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864992451767) 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 15 ways as a sum of consecutive naturals, for example, 80940079 + ... + 81197452.

It is an arithmetic number, because the mean of its divisors is an integer number (1481126354820).

Almost surely, 2^{20864992451797} is an apocalyptic number.

It is an amenable number.

20864992451797 is a deficient number, since it is larger than the sum of its proper divisors (2833029225323).

20864992451797 is a wasteful number, since it uses less digits than its factorization.

20864992451797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162138084.

The product of its (nonzero) digits is 548674560, while the sum is 73.

The spelling of 20864992451797 in words is "twenty trillion, eight hundred sixty-four billion, nine hundred ninety-two million, four hundred fifty-one thousand, seven hundred ninety-seven".