20778788579 has 16 divisors (see below), whose sum is σ = 21655019520. Its totient is φ = 19913675040.

The previous prime is 20778788573. The next prime is 20778788587. The reversal of 20778788579 is 97588787702.

It is a cyclic number.

It is not a de Polignac number, because 20778788579 - 2²⁰ = 20777740003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20778788573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2693642 + ... + 2701344.

It is an arithmetic number, because the mean of its divisors is an integer number (1353438720).

Almost surely, 2^20778788579 is an apocalyptic number.

20778788579 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20778788579 is a deficient number, since it is larger than the sum of its proper divisors (876230941).

20778788579 is a wasteful number, since it uses less digits than its factorization.

20778788579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8410.

The product of its (nonzero) digits is 110638080, while the sum is 68.

The spelling of 20778788579 in words is "twenty billion, seven hundred seventy-eight million, seven hundred eighty-eight thousand, five hundred seventy-nine".