19834356172820 has 96 divisors (see below), whose sum is σ = 50109487384320. Its totient is φ = 6442226611200.

The previous prime is 19834356172811. The next prime is 19834356172871. The reversal of 19834356172820 is 2827165343891.

It is a self number, because there is not a number n which added to its sum of digits gives 19834356172820.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 95126522 + ... + 95334798.

It is an arithmetic number, because the mean of its divisors is an integer number (521973826920).

It is a 2-persistent number, because it is pandigital, and so is 2⋅19834356172820 = 39668712345640, but 3⋅19834356172820 = 59503068518460 is not.

Almost surely, 2^{19834356172820} is an apocalyptic number.

19834356172820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19834356172820 is an abundant number, since it is smaller than the sum of its proper divisors (30275131211500).

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

19834356172820 is a wasteful number, since it uses less digits than its factorization.

19834356172820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244113 (or 244111 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 19834356172820 in words is "nineteen trillion, eight hundred thirty-four billion, three hundred fifty-six million, one hundred seventy-two thousand, eight hundred twenty".