20131223530 has 32 divisors (see below), whose sum is σ = 39538067328. Its totient is φ = 7319025600.

The previous prime is 20131223521. The next prime is 20131223531. The reversal of 20131223530 is 3532213102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20131223531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674320 + ... + 703540.

It is an arithmetic number, because the mean of its divisors is an integer number (1235564604).

Almost surely, 2^20131223530 is an apocalyptic number.

20131223530 is a deficient number, since it is larger than the sum of its proper divisors (19406843798).

20131223530 is a wasteful number, since it uses less digits than its factorization.

20131223530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35502.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 20131223530 its reverse (3532213102), we get a palindrome (23663436632).

The spelling of 20131223530 in words is "twenty billion, one hundred thirty-one million, two hundred twenty-three thousand, five hundred thirty".