19903868 has 24 divisors (see below), whose sum is σ = 37042320. Its totient is φ = 9331200.

The previous prime is 19903861. The next prime is 19903903. The reversal of 19903868 is 86830991.

It is a super-2 number, since 2×19903868² = 792327922722848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19903861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6380 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (1543430).

Almost surely, 2^19903868 is an apocalyptic number.

It is an amenable number.

19903868 is a deficient number, since it is larger than the sum of its proper divisors (17138452).

19903868 is a wasteful number, since it uses less digits than its factorization.

19903868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717 (or 2715 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 19903868 is about 4461.3751243311. The cubic root of 19903868 is about 271.0061589991.

The spelling of 19903868 in words is "nineteen million, nine hundred three thousand, eight hundred sixty-eight".