19805151704 has 64 divisors (see below), whose sum is σ = 40647294240. Its totient is φ = 8991544320.

The previous prime is 19805151661. The next prime is 19805151713. The reversal of 19805151704 is 40715150891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3010739 + ... + 3017309.

Almost surely, 2^19805151704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19805151704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20323647120).

19805151704 is an abundant number, since it is smaller than the sum of its proper divisors (20842142536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19805151704 is a wasteful number, since it uses less digits than its factorization.

19805151704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060 (or 7056 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 19805151704 in words is "nineteen billion, eight hundred five million, one hundred fifty-one thousand, seven hundred four".