19800019836 has 48 divisors (see below), whose sum is σ = 51737620480. Its totient is φ = 6548033520.

The previous prime is 19800019807. The next prime is 19800019861. The reversal of 19800019836 is 63891000891.

It is a junction number, because it is equal to n+sod(n) for n = 19800019791 and 19800019800.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 708070 + ... + 735501.

Almost surely, 2^19800019836 is an apocalyptic number.

It is an amenable number.

19800019836 is an abundant number, since it is smaller than the sum of its proper divisors (31937600644).

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

19800019836 is a wasteful number, since it uses less digits than its factorization.

19800019836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443711 (or 1443703 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 19800019836 in words is "nineteen billion, eight hundred million, nineteen thousand, eight hundred thirty-six".