20131142 has 4 divisors (see below), whose sum is σ = 30196716. Its totient is φ = 10065570.

The previous prime is 20131129. The next prime is 20131147. The reversal of 20131142 is 24113102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5032784 + ... + 5032787.

It is an arithmetic number, because the mean of its divisors is an integer number (7549179).

Almost surely, 2^20131142 is an apocalyptic number.

20131142 is a deficient number, since it is larger than the sum of its proper divisors (10065574).

20131142 is a wasteful number, since it uses less digits than its factorization.

20131142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065573.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20131142 is about 4486.7741195652. The cubic root of 20131142 is about 272.0337598667.

Adding to 20131142 its reverse (24113102), we get a palindrome (44244244).

The spelling of 20131142 in words is "twenty million, one hundred thirty-one thousand, one hundred forty-two".