19539734680 has 32 divisors (see below), whose sum is σ = 44300021040. Its totient is φ = 7756228480.

The previous prime is 19539734671. The next prime is 19539734681. The reversal of 19539734680 is 8643793591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19539734681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1859239 + ... + 1869718.

Almost surely, 2^19539734680 is an apocalyptic number.

19539734680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19539734680 is an abundant number, since it is smaller than the sum of its proper divisors (24760286360).

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

19539734680 is a wasteful number, since it uses less digits than its factorization.

19539734680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3729099 (or 3729095 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 19539734680 in words is "nineteen billion, five hundred thirty-nine million, seven hundred thirty-four thousand, six hundred eighty".