19868011 has 4 divisors (see below), whose sum is σ = 19972224. Its totient is φ = 19763800.

The previous prime is 19868003. The next prime is 19868027. The reversal of 19868011 is 11086891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19868011 - 2³ = 19868003 is a prime.

It is a super-2 number, since 2×19868011² = 789475722192242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19868111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51820 + ... + 52201.

It is an arithmetic number, because the mean of its divisors is an integer number (4993056).

Almost surely, 2^19868011 is an apocalyptic number.

19868011 is a deficient number, since it is larger than the sum of its proper divisors (104213).

19868011 is a wasteful number, since it uses less digits than its factorization.

19868011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104212.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 19868011 is about 4457.3547087931. The cubic root of 19868011 is about 270.8433211517.

The spelling of 19868011 in words is "nineteen million, eight hundred sixty-eight thousand, eleven".