20679778825 has 12 divisors (see below), whose sum is σ = 25656718480. Its totient is φ = 16534924560.

The previous prime is 20679778813. The next prime is 20679778829. The reversal of 20679778825 is 52887797602.

It is not a de Polignac number, because 20679778825 - 2⁷ = 20679778697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20679778829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174855 + ... + 268204.

Almost surely, 2^20679778825 is an apocalyptic number.

20679778825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20679778825 is a deficient number, since it is larger than the sum of its proper divisors (4976939655).

20679778825 is a wasteful number, since it uses less digits than its factorization.

20679778825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444936 (or 444931 counting only the distinct ones).

The product of its (nonzero) digits is 23708160, while the sum is 61.

The spelling of 20679778825 in words is "twenty billion, six hundred seventy-nine million, seven hundred seventy-eight thousand, eight hundred twenty-five".