19508985 has 16 divisors (see below), whose sum is σ = 34682880. Its totient is φ = 10404720.

The previous prime is 19508969. The next prime is 19509011. The reversal of 19508985 is 58980591.

It is not a de Polignac number, because 19508985 - 2⁴ = 19508969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19508985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72121 + ... + 72390.

It is an arithmetic number, because the mean of its divisors is an integer number (2167680).

Almost surely, 2^19508985 is an apocalyptic number.

19508985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19508985 is a deficient number, since it is larger than the sum of its proper divisors (15173895).

19508985 is a wasteful number, since it uses less digits than its factorization.

19508985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144525 (or 144519 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 19508985 is about 4416.8976669151. The cubic root of 19508985 is about 269.2019645688.

The spelling of 19508985 in words is "nineteen million, five hundred eight thousand, nine hundred eighty-five".