19985684610 has 32 divisors (see below), whose sum is σ = 48214183680. Its totient is φ = 5301900288.

The previous prime is 19985684591. The next prime is 19985684639. The reversal of 19985684610 is 1648658991.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 1720090 + ... + 1731669.

It is an arithmetic number, because the mean of its divisors is an integer number (1506693240).

Almost surely, 2^19985684610 is an apocalyptic number.

19985684610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19985684610 is an abundant number, since it is smaller than the sum of its proper divisors (28228499070).

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

19985684610 is a wasteful number, since it uses less digits than its factorization.

19985684610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451962.

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 19985684610 in words is "nineteen billion, nine hundred eighty-five million, six hundred eighty-four thousand, six hundred ten".