19798973820 has 72 divisors (see below), whose sum is σ = 60731732880. Its totient is φ = 5220399360.

The previous prime is 19798973819. The next prime is 19798973833. The reversal of 19798973820 is 2837989791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 601926 + ... + 633965.

It is an arithmetic number, because the mean of its divisors is an integer number (843496290).

Almost surely, 2^19798973820 is an apocalyptic number.

19798973820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19798973820 is an abundant number, since it is smaller than the sum of its proper divisors (40932759060).

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

19798973820 is a wasteful number, since it uses less digits than its factorization.

19798973820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235995 (or 1235990 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 63.

The spelling of 19798973820 in words is "nineteen billion, seven hundred ninety-eight million, nine hundred seventy-three thousand, eight hundred twenty".