20779432718797 has 4 divisors (see below), whose sum is σ = 20793005178016. Its totient is φ = 20765860259580.

The previous prime is 20779432718743. The next prime is 20779432718813. The reversal of 20779432718797 is 79781723497702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20779432718797 - 2¹⁵ = 20779432686029 is a prime.

It is a super-2 number, since 2×20779432718797² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20779432748797) 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 3 ways as a sum of consecutive naturals, for example, 6786227313 + ... + 6786230374.

It is an arithmetic number, because the mean of its divisors is an integer number (5198251294504).

Almost surely, 2^{20779432718797} is an apocalyptic number.

It is an amenable number.

20779432718797 is a deficient number, since it is larger than the sum of its proper divisors (13572459219).

20779432718797 is a wasteful number, since it uses less digits than its factorization.

20779432718797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572459218.

The product of its (nonzero) digits is 522764928, while the sum is 73.

The spelling of 20779432718797 in words is "twenty trillion, seven hundred seventy-nine billion, four hundred thirty-two million, seven hundred eighteen thousand, seven hundred ninety-seven".