20111442 has 64 divisors (see below), whose sum is σ = 47537280. Its totient is φ = 5612544.

The previous prime is 20111411. The next prime is 20111447. The reversal of 20111442 is 24411102.

It is not an unprimeable number, because it can be changed into a prime (20111447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38193 + ... + 38715.

It is an arithmetic number, because the mean of its divisors is an integer number (742770).

Almost surely, 2^20111442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23768640).

20111442 is an abundant number, since it is smaller than the sum of its proper divisors (27425838).

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

20111442 is a wasteful number, since it uses less digits than its factorization.

20111442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20111442 is about 4484.5782410389. The cubic root of 20111442 is about 271.9449950049.

Adding to 20111442 its reverse (24411102), we get a palindrome (44522544).

The spelling of 20111442 in words is "twenty million, one hundred eleven thousand, four hundred forty-two".