19808002005 has 16 divisors (see below), whose sum is σ = 34573967424. Its totient is φ = 9603879680.

The previous prime is 19808002003. The next prime is 19808002031. The reversal of 19808002005 is 50020080891.

It is a happy number.

It is not a de Polignac number, because 19808002005 - 2¹ = 19808002003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19808002003) 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 15 ways as a sum of consecutive naturals, for example, 60024084 + ... + 60024413.

It is an arithmetic number, because the mean of its divisors is an integer number (2160872964).

Almost surely, 2^19808002005 is an apocalyptic number.

19808002005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19808002005 is a deficient number, since it is larger than the sum of its proper divisors (14765965419).

19808002005 is a wasteful number, since it uses less digits than its factorization.

19808002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120048516.

The product of its (nonzero) digits is 5760, while the sum is 33.

Adding to 19808002005 its reverse (50020080891), we get a palindrome (69828082896).

The spelling of 19808002005 in words is "nineteen billion, eight hundred eight million, two thousand, five".