19943823040 has 56 divisors (see below), whose sum is σ = 47793840912. Its totient is φ = 7926696960.

The previous prime is 19943823023. The next prime is 19943823083. The reversal of 19943823040 is 4032834991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148246 + ... + 248725.

Almost surely, 2^19943823040 is an apocalyptic number.

19943823040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19943823040 is an abundant number, since it is smaller than the sum of its proper divisors (27850017872).

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

19943823040 is a wasteful number, since it uses less digits than its factorization.

19943823040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397145 (or 397135 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 19943823040 in words is "nineteen billion, nine hundred forty-three million, eight hundred twenty-three thousand, forty".