20131231134432 has 96 divisors (see below), whose sum is σ = 57650420459520. Its totient is φ = 6100172549120.

The previous prime is 20131231134419. The next prime is 20131231134473. The reversal of 20131231134432 is 23443113213102.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 20131231134432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33561244 + ... + 34155812.

It is an arithmetic number, because the mean of its divisors is an integer number (600525213120).

Almost surely, 2^{20131231134432} is an apocalyptic number.

20131231134432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20131231134432 is an abundant number, since it is smaller than the sum of its proper divisors (37519189325088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20131231134432 is a wasteful number, since it uses less digits than its factorization.

20131231134432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626656 (or 626648 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 20131231134432 its reverse (23443113213102), we get a palindrome (43574344347534).

The spelling of 20131231134432 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred thirty-four thousand, four hundred thirty-two".