20996775125 has 16 divisors (see below), whose sum is σ = 26300711424. Its totient is φ = 16735410000.

The previous prime is 20996775119. The next prime is 20996775143. The reversal of 20996775125 is 52157769902.

It is not a de Polignac number, because 20996775125 - 2¹⁰ = 20996774101 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 276041 + ... + 343790.

It is an arithmetic number, because the mean of its divisors is an integer number (1643794464).

Almost surely, 2^20996775125 is an apocalyptic number.

20996775125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20996775125 is a deficient number, since it is larger than the sum of its proper divisors (5303936299).

20996775125 is an equidigital number, since it uses as much as digits as its factorization.

20996775125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620117 (or 620107 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 53.

The spelling of 20996775125 in words is "twenty billion, nine hundred ninety-six million, seven hundred seventy-five thousand, one hundred twenty-five".