20431234400 has 36 divisors (see below), whose sum is σ = 49877752932. Its totient is φ = 8172493440.

The previous prime is 20431234357. The next prime is 20431234429. The reversal of 20431234400 is 443213402.

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, 12768722 + ... + 12770321.

It is an arithmetic number, because the mean of its divisors is an integer number (1385493137).

Almost surely, 2^20431234400 is an apocalyptic number.

20431234400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431234400 is an abundant number, since it is smaller than the sum of its proper divisors (29446518532).

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

20431234400 is a wasteful number, since it uses less digits than its factorization.

20431234400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25539063 (or 25539050 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20431234400 its reverse (443213402), we get a palindrome (20874447802).

The spelling of 20431234400 in words is "twenty billion, four hundred thirty-one million, two hundred thirty-four thousand, four hundred".