20866444313 has 12 divisors (see below), whose sum is σ = 24700141284. Its totient is φ = 17510301600.

The previous prime is 20866444303. The next prime is 20866444331. The reversal of 20866444313 is 31344466802.

It can be written as a sum of positive squares in 2 ways, for example, as 3112747264 + 17753697049 = 55792^2 + 133243^2 .

It is not a de Polignac number, because 20866444313 - 2¹⁶ = 20866378777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20866444303) 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 11 ways as a sum of consecutive naturals, for example, 6631118 + ... + 6634263.

It is an arithmetic number, because the mean of its divisors is an integer number (2058345107).

Almost surely, 2^20866444313 is an apocalyptic number.

It is an amenable number.

20866444313 is a deficient number, since it is larger than the sum of its proper divisors (3833696971).

20866444313 is a wasteful number, since it uses less digits than its factorization.

20866444313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13265416 (or 13265405 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 41.

The spelling of 20866444313 in words is "twenty billion, eight hundred sixty-six million, four hundred forty-four thousand, three hundred thirteen".