20312534 has 16 divisors (see below), whose sum is σ = 33371136. Its totient is φ = 9196200.

The previous prime is 20312531. The next prime is 20312543. The reversal of 20312534 is 43521302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4259 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (2085696).

Almost surely, 2^20312534 is an apocalyptic number.

20312534 is a deficient number, since it is larger than the sum of its proper divisors (13058602).

20312534 is a wasteful number, since it uses less digits than its factorization.

20312534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20312534 is about 4506.9428662897. The cubic root of 20312534 is about 272.8483730005.

Adding to 20312534 its reverse (43521302), we get a palindrome (63833836).

The spelling of 20312534 in words is "twenty million, three hundred twelve thousand, five hundred thirty-four".