20395629899 has 4 divisors (see below), whose sum is σ = 20444307240. Its totient is φ = 20346952560.

The previous prime is 20395629869. The next prime is 20395629901. The reversal of 20395629899 is 99892659302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20395629899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20395629869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24338042 + ... + 24338879.

It is an arithmetic number, because the mean of its divisors is an integer number (5111076810).

Almost surely, 2^20395629899 is an apocalyptic number.

20395629899 is a deficient number, since it is larger than the sum of its proper divisors (48677341).

20395629899 is an equidigital number, since it uses as much as digits as its factorization.

20395629899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48677340.

The product of its (nonzero) digits is 18895680, while the sum is 62.

The spelling of 20395629899 in words is "twenty billion, three hundred ninety-five million, six hundred twenty-nine thousand, eight hundred ninety-nine".