20729661319679 has 8 divisors (see below), whose sum is σ = 22330576643760. Its totient is φ = 19129649708736.

The previous prime is 20729661319597. The next prime is 20729661319687. The reversal of 20729661319679 is 97691316692702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20729661319679 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 (20729661315679) 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 7 ways as a sum of consecutive naturals, for example, 225880637 + ... + 225972390.

It is an arithmetic number, because the mean of its divisors is an integer number (2791322080470).

Almost surely, 2^{20729661319679} is an apocalyptic number.

20729661319679 is a deficient number, since it is larger than the sum of its proper divisors (1600915324081).

20729661319679 is a wasteful number, since it uses less digits than its factorization.

20729661319679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451856569.

The product of its (nonzero) digits is 92588832, while the sum is 68.

The spelling of 20729661319679 in words is "twenty trillion, seven hundred twenty-nine billion, six hundred sixty-one million, three hundred nineteen thousand, six hundred seventy-nine".