20143142 has 4 divisors (see below), whose sum is σ = 30214716. Its totient is φ = 10071570.

The previous prime is 20143129. The next prime is 20143153. The reversal of 20143142 is 24134102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20143142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5035784 + ... + 5035787.

It is an arithmetic number, because the mean of its divisors is an integer number (7553679).

Almost surely, 2^20143142 is an apocalyptic number.

20143142 is a deficient number, since it is larger than the sum of its proper divisors (10071574).

20143142 is a wasteful number, since it uses less digits than its factorization.

20143142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10071573.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20143142 is about 4488.1111840060. Note that the first 4 decimals coincide. The cubic root of 20143142 is about 272.0878014557.

Adding to 20143142 its reverse (24134102), we get a palindrome (44277244).

The spelling of 20143142 in words is "twenty million, one hundred forty-three thousand, one hundred forty-two".