20111142 has 16 divisors (see below), whose sum is σ = 40465152. Its totient is φ = 6663240.

The previous prime is 20111137. The next prime is 20111167. The reversal of 20111142 is 24111102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9034 + ... + 11037.

It is an arithmetic number, because the mean of its divisors is an integer number (2529072).

Almost surely, 2^20111142 is an apocalyptic number.

20111142 is an abundant number, since it is smaller than the sum of its proper divisors (20354010).

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

20111142 is a wasteful number, since it uses less digits than its factorization.

20111142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20243.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 20111142 is about 4484.5447929528. The cubic root of 20111142 is about 271.9436428077.

Adding to 20111142 its reverse (24111102), we get a palindrome (44222244).

The spelling of 20111142 in words is "twenty million, one hundred eleven thousand, one hundred forty-two".