20039003905 has 4 divisors (see below), whose sum is σ = 24046804692. Its totient is φ = 16031203120.

The previous prime is 20039003903. The next prime is 20039003909. The reversal of 20039003905 is 50930093002.

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 14446357249 + 5592646656 = 120193^2 + 74784^2 .

It is not a de Polignac number, because 20039003905 - 2¹ = 20039003903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20039003903) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2003900386 + ... + 2003900395.

It is an arithmetic number, because the mean of its divisors is an integer number (6011701173).

Almost surely, 2^20039003905 is an apocalyptic number.

It is an amenable number.

20039003905 is a deficient number, since it is larger than the sum of its proper divisors (4007800787).

20039003905 is an equidigital number, since it uses as much as digits as its factorization.

20039003905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007800786.

The product of its (nonzero) digits is 7290, while the sum is 31.

Adding to 20039003905 its reverse (50930093002), we get a palindrome (70969096907).

The spelling of 20039003905 in words is "twenty billion, thirty-nine million, three thousand, nine hundred five".