19869868 has 24 divisors (see below), whose sum is σ = 35611632. Its totient is φ = 9698304.

The previous prime is 19869841. The next prime is 19869869. The reversal of 19869868 is 86896891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19869869) 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, 31896 + ... + 32512.

It is an arithmetic number, because the mean of its divisors is an integer number (1483818).

Almost surely, 2^19869868 is an apocalyptic number.

It is an amenable number.

19869868 is a deficient number, since it is larger than the sum of its proper divisors (15741764).

19869868 is a wasteful number, since it uses less digits than its factorization.

19869868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 799 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The square root of 19869868 is about 4457.5630113325. The cubic root of 19869868 is about 270.8517591777.

The spelling of 19869868 in words is "nineteen million, eight hundred sixty-nine thousand, eight hundred sixty-eight".