19993854 has 16 divisors (see below), whose sum is σ = 41726592. Its totient is φ = 6374808.

The previous prime is 19993849. The next prime is 19993889. The reversal of 19993854 is 45839991.

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 7 ways as a sum of consecutive naturals, for example, 72304 + ... + 72579.

It is an arithmetic number, because the mean of its divisors is an integer number (2607912).

Almost surely, 2^19993854 is an apocalyptic number.

19993854 is an abundant number, since it is smaller than the sum of its proper divisors (21732738).

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

19993854 is a wasteful number, since it uses less digits than its factorization.

19993854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144911.

The product of its digits is 349920, while the sum is 48.

The square root of 19993854 is about 4471.4487585122. The cubic root of 19993854 is about 271.4139541264.

The spelling of 19993854 in words is "nineteen million, nine hundred ninety-three thousand, eight hundred fifty-four".