20678802279 has 4 divisors (see below), whose sum is σ = 27571736376. Its totient is φ = 13785868184.

The previous prime is 20678802259. The next prime is 20678802283. The reversal of 20678802279 is 97220887602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20678802279 - 2¹⁷ = 20678671207 is a prime.

It is a super-2 number, since 2×20678802279² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678802259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446467044 + ... + 3446467049.

It is an arithmetic number, because the mean of its divisors is an integer number (6892934094).

Almost surely, 2^20678802279 is an apocalyptic number.

20678802279 is a deficient number, since it is larger than the sum of its proper divisors (6892934097).

20678802279 is an equidigital number, since it uses as much as digits as its factorization.

20678802279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6892934096.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 20678802279 in words is "twenty billion, six hundred seventy-eight million, eight hundred two thousand, two hundred seventy-nine".