20516234 has 8 divisors (see below), whose sum is σ = 31767168. Its totient is φ = 9927180.

The previous prime is 20516233. The next prime is 20516239. The reversal of 20516234 is 43261502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20516233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165392 + ... + 165515.

It is an arithmetic number, because the mean of its divisors is an integer number (3970896).

Almost surely, 2^20516234 is an apocalyptic number.

20516234 is a deficient number, since it is larger than the sum of its proper divisors (11250934).

20516234 is a wasteful number, since it uses less digits than its factorization.

20516234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330940.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20516234 is about 4529.4849596836. The cubic root of 20516234 is about 273.7574086664.

Adding to 20516234 its reverse (43261502), we get a palindrome (63777736).

The spelling of 20516234 in words is "twenty million, five hundred sixteen thousand, two hundred thirty-four".