20085379649 has 2 divisors, whose sum is σ = 20085379650. Its totient is φ = 20085379648.

The previous prime is 20085379597. The next prime is 20085379697. The reversal of 20085379649 is 94697358002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16573987600 + 3511392049 = 128740^2 + 59257^2 .

It is a cyclic number.

It is not a de Polignac number, because 20085379649 - 2⁸ = 20085379393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20085379649.

It is not a weakly prime, because it can be changed into another prime (20085375649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042689824 + 10042689825.

It is an arithmetic number, because the mean of its divisors is an integer number (10042689825).

Almost surely, 2^20085379649 is an apocalyptic number.

It is an amenable number.

20085379649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085379649 is an equidigital number, since it uses as much as digits as its factorization.

20085379649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 20085379649 in words is "twenty billion, eighty-five million, three hundred seventy-nine thousand, six hundred forty-nine".