19903211928 has 24 divisors (see below), whose sum is σ = 53904532500. Its totient is φ = 6634403952.

The previous prime is 19903211921. The next prime is 19903211963. The reversal of 19903211928 is 82911230991.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×19903211928² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19903211921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138216678 + ... + 138216821.

Almost surely, 2^19903211928 is an apocalyptic number.

19903211928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19903211928 is an abundant number, since it is smaller than the sum of its proper divisors (34001320572).

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

19903211928 is a wasteful number, since it uses less digits than its factorization.

19903211928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276433511 (or 276433504 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The spelling of 19903211928 in words is "nineteen billion, nine hundred three million, two hundred eleven thousand, nine hundred twenty-eight".