20111966 has 16 divisors (see below), whose sum is σ = 34785504. Its totient is φ = 8542464.

The previous prime is 20111947. The next prime is 20111981. The reversal of 20111966 is 66911102.

It is a Curzon number.

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, 4775 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (2174094).

Almost surely, 2^20111966 is an apocalyptic number.

20111966 is a deficient number, since it is larger than the sum of its proper divisors (14673538).

20111966 is a wasteful number, since it uses less digits than its factorization.

20111966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12835.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20111966 is about 4484.6366630977. The cubic root of 20111966 is about 271.9473568103.

It can be divided in two parts, 201 and 11966, that added together give a cube (12167 = 23³).

The spelling of 20111966 in words is "twenty million, one hundred eleven thousand, nine hundred sixty-six".