19857297108 has 48 divisors (see below), whose sum is σ = 50555381184. Its totient is φ = 6016227840.

The previous prime is 19857297073. The next prime is 19857297113. The reversal of 19857297108 is 80179275891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920866 + ... + 942182.

It is an arithmetic number, because the mean of its divisors is an integer number (1053237108).

Almost surely, 2^19857297108 is an apocalyptic number.

It is an amenable number.

19857297108 is an abundant number, since it is smaller than the sum of its proper divisors (30698084076).

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

19857297108 is a wasteful number, since it uses less digits than its factorization.

19857297108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28392 (or 28390 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 57.

The spelling of 19857297108 in words is "nineteen billion, eight hundred fifty-seven million, two hundred ninety-seven thousand, one hundred eight".