19947038490 has 24 divisors (see below), whose sum is σ = 51862300308. Its totient is φ = 5319210240.

The previous prime is 19947038473. The next prime is 19947038497. The reversal of 19947038490 is 9483074991.

19947038490 is a `hidden beast` number, since 1 + 9 + 9 + 470 + 3 + 84 + 90 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17639292969 + 2307745521 = 132813^2 + 48039^2 .

It is not an unprimeable number, because it can be changed into a prime (19947038497) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 110816791 + ... + 110816970.

Almost surely, 2^19947038490 is an apocalyptic number.

19947038490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19947038490 is an abundant number, since it is smaller than the sum of its proper divisors (31915261818).

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

19947038490 is a wasteful number, since it uses less digits than its factorization.

19947038490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221633774 (or 221633771 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 19947038490 in words is "nineteen billion, nine hundred forty-seven million, thirty-eight thousand, four hundred ninety".