19909248208 has 10 divisors (see below), whose sum is σ = 38574168434. Its totient is φ = 9954624096.

The previous prime is 19909248187. The next prime is 19909248221. The reversal of 19909248208 is 80284290991.

It can be written as a sum of positive squares in only one way, i.e., 19665013824 + 244234384 = 140232^2 + 15628^2 .

It is a super-2 number, since 2×19909248208² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622163991 + ... + 622164022.

Almost surely, 2^19909248208 is an apocalyptic number.

It is an amenable number.

19909248208 is a deficient number, since it is larger than the sum of its proper divisors (18664920226).

19909248208 is a wasteful number, since it uses less digits than its factorization.

19909248208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244328021 (or 1244328015 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 19909248208 in words is "nineteen billion, nine hundred nine million, two hundred forty-eight thousand, two hundred eight".