20111994 has 96 divisors (see below), whose sum is σ = 54312960. Its totient is φ = 5248800.

The previous prime is 20111981. The next prime is 20111999. The reversal of 20111994 is 49911102.

It is not an unprimeable number, because it can be changed into a prime (20111999) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 74079 + ... + 74349.

It is an arithmetic number, because the mean of its divisors is an integer number (565760).

Almost surely, 2^20111994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27156480).

20111994 is an abundant number, since it is smaller than the sum of its proper divisors (34200966).

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

20111994 is a wasteful number, since it uses less digits than its factorization.

20111994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 20111994 is about 4484.6397848657. The cubic root of 20111994 is about 271.9474830125.

It can be divided in two parts, 2011 and 1994, that added together give a triangular number (4005 = T₈₉).

The spelling of 20111994 in words is "twenty million, one hundred eleven thousand, nine hundred ninety-four".