19903742208 has 216 divisors, whose sum is σ = 68438418048. Its totient is φ = 5439430656.

The previous prime is 19903742203. The next prime is 19903742213. The reversal of 19903742208 is 80224730991.

19903742208 is a `hidden beast` number, since 199 + 0 + 37 + 422 + 0 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (19903742203) and next prime (19903742213).

It is not an unprimeable number, because it can be changed into a prime (19903742203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344116 + ... + 397772.

It is an arithmetic number, because the mean of its divisors is an integer number (316844528).

Almost surely, 2^19903742208 is an apocalyptic number.

19903742208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19903742208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34219209024).

19903742208 is an abundant number, since it is smaller than the sum of its proper divisors (48534675840).

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

19903742208 is a wasteful number, since it uses less digits than its factorization.

19903742208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53709 (or 53692 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 19903742208 in words is "nineteen billion, nine hundred three million, seven hundred forty-two thousand, two hundred eight".