19209217920 has 64 divisors (see below), whose sum is σ = 61229388240. Its totient is φ = 5122457600.

The previous prime is 19209217897. The next prime is 19209217997. The reversal of 19209217920 is 2971290291.

It is a tau number, because it is divible by the number of its divisors (64).

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 7 ways as a sum of consecutive naturals, for example, 5000481 + ... + 5004320.

Almost surely, 2^19209217920 is an apocalyptic number.

19209217920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19209217920 is an abundant number, since it is smaller than the sum of its proper divisors (42020170320).

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

19209217920 is a wasteful number, since it uses less digits than its factorization.

19209217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10004823 (or 10004811 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

It can be divided in two parts, 192092 and 17920, that added together give a palindrome (210012).

The spelling of 19209217920 in words is "nineteen billion, two hundred nine million, two hundred seventeen thousand, nine hundred twenty".