19985208050 has 24 divisors (see below), whose sum is σ = 37198632900. Its totient is φ = 7988460480.

The previous prime is 19985208017. The next prime is 19985208077. The reversal of 19985208050 is 5080258991.

It can be written as a sum of positive squares in 6 ways, for example, as 6622541641 + 13362666409 = 81379^2 + 115597^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19985207986 and 19985208004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68405 + ... + 211304.

Almost surely, 2^19985208050 is an apocalyptic number.

19985208050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19985208050 is a deficient number, since it is larger than the sum of its proper divisors (17213424850).

19985208050 is a wasteful number, since it uses less digits than its factorization.

19985208050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281150 (or 281145 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 47.

The spelling of 19985208050 in words is "nineteen billion, nine hundred eighty-five million, two hundred eight thousand, fifty".