20131231004434 has 16 divisors (see below), whose sum is σ = 33214262427936. Its totient is φ = 9150559546260.

The previous prime is 20131231004429. The next prime is 20131231004447. The reversal of 20131231004434 is 43440013213102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3781220292 + ... + 3781225615.

It is an arithmetic number, because the mean of its divisors is an integer number (2075891401746).

Almost surely, 2^{20131231004434} is an apocalyptic number.

20131231004434 is a deficient number, since it is larger than the sum of its proper divisors (13083031423502).

20131231004434 is an equidigital number, since it uses as much as digits as its factorization.

20131231004434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562445942 (or 7562445920 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 20131231004434 its reverse (43440013213102), we get a palindrome (63571244217536).

The spelling of 20131231004434 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-one million, four thousand, four hundred thirty-four".