20830142 has 4 divisors (see below), whose sum is σ = 31245216. Its totient is φ = 10415070.

The previous prime is 20830141. The next prime is 20830153. The reversal of 20830142 is 24103802.

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 (20830141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5207534 + ... + 5207537.

It is an arithmetic number, because the mean of its divisors is an integer number (7811304).

Almost surely, 2^20830142 is an apocalyptic number.

20830142 is a deficient number, since it is larger than the sum of its proper divisors (10415074).

20830142 is a wasteful number, since it uses less digits than its factorization.

20830142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10415073.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20830142 is about 4564.0050394363. The cubic root of 20830142 is about 275.1465532898.

Adding to 20830142 its reverse (24103802), we get a palindrome (44933944).

The spelling of 20830142 in words is "twenty million, eight hundred thirty thousand, one hundred forty-two".