19855996430 has 48 divisors (see below), whose sum is σ = 38007385920. Its totient is φ = 7467222528.

The previous prime is 19855996361. The next prime is 19855996451. The reversal of 19855996430 is 3469955891.

It is a self number, because there is not a number n which added to its sum of digits gives 19855996430.

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 23 ways as a sum of consecutive naturals, for example, 3184556 + ... + 3190784.

It is an arithmetic number, because the mean of its divisors is an integer number (791820540).

Almost surely, 2^19855996430 is an apocalyptic number.

19855996430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19855996430 is a deficient number, since it is larger than the sum of its proper divisors (18151389490).

19855996430 is a wasteful number, since it uses less digits than its factorization.

19855996430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7373 (or 7356 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 59.

The spelling of 19855996430 in words is "nineteen billion, eight hundred fifty-five million, nine hundred ninety-six thousand, four hundred thirty".