20131234400 has 36 divisors (see below), whose sum is σ = 49145377932. Its totient is φ = 8052493440.

The previous prime is 20131234399. The next prime is 20131234427. The reversal of 20131234400 is 443213102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12581222 + ... + 12582821.

It is an arithmetic number, because the mean of its divisors is an integer number (1365149387).

Almost surely, 2^20131234400 is an apocalyptic number.

20131234400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131234400 is an abundant number, since it is smaller than the sum of its proper divisors (29014143532).

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

20131234400 is a wasteful number, since it uses less digits than its factorization.

20131234400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25164063 (or 25164050 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20131234400 its reverse (443213102), we get a palindrome (20574447502).

The spelling of 20131234400 in words is "twenty billion, one hundred thirty-one million, two hundred thirty-four thousand, four hundred".