19854569940 has 24 divisors (see below), whose sum is σ = 55592796000. Its totient is φ = 5294551968.

The previous prime is 19854569929. The next prime is 19854569941. The reversal of 19854569940 is 4996545891.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 330909499 = 19854569940 / (1 + 9 + 8 + 5 + 4 + 5 + 6 + 9 + 9 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19854569941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165454690 + ... + 165454809.

It is an arithmetic number, because the mean of its divisors is an integer number (2316366500).

Almost surely, 2^19854569940 is an apocalyptic number.

19854569940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19854569940 is an abundant number, since it is smaller than the sum of its proper divisors (35738226060).

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

19854569940 is a wasteful number, since it uses less digits than its factorization.

19854569940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330909511 (or 330909509 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 19854569940 in words is "nineteen billion, eight hundred fifty-four million, five hundred sixty-nine thousand, nine hundred forty".