20256244013 has 4 divisors (see below), whose sum is σ = 20316351900. Its totient is φ = 20196136128.

The previous prime is 20256243991. The next prime is 20256244031. The reversal of 20256244013 is 31044265202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7279161124 + 12977082889 = 85318^2 + 113917^2 .

It is a cyclic number.

It is not a de Polignac number, because 20256244013 - 2⁶ = 20256243949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256244093) 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, 30053438 + ... + 30054111.

It is an arithmetic number, because the mean of its divisors is an integer number (5079087975).

Almost surely, 2^20256244013 is an apocalyptic number.

It is an amenable number.

20256244013 is a deficient number, since it is larger than the sum of its proper divisors (60107887).

20256244013 is an equidigital number, since it uses as much as digits as its factorization.

20256244013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60107886.

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 20256244013 in words is "twenty billion, two hundred fifty-six million, two hundred forty-four thousand, thirteen".