19635913820 has 48 divisors (see below), whose sum is σ = 42421579200. Its totient is φ = 7631310336.

The previous prime is 19635913819. The next prime is 19635913849. The reversal of 19635913820 is 2831953691.

It is a super-2 number, since 2×19635913820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19256 + ... + 199104.

It is an arithmetic number, because the mean of its divisors is an integer number (883782900).

Almost surely, 2^19635913820 is an apocalyptic number.

19635913820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19635913820 is an abundant number, since it is smaller than the sum of its proper divisors (22785665380).

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

19635913820 is a wasteful number, since it uses less digits than its factorization.

19635913820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180014 (or 180012 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 19635913820 in words is "nineteen billion, six hundred thirty-five million, nine hundred thirteen thousand, eight hundred twenty".