20431041400434 has 128 divisors (see below), whose sum is σ = 48263588259840. Its totient is φ = 5645195472384.

The previous prime is 20431041400421. The next prime is 20431041400453. The reversal of 20431041400434 is 43400414013402.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 256544529 + ... + 256624155.

It is an arithmetic number, because the mean of its divisors is an integer number (377059283280).

Almost surely, 2^{20431041400434} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20431041400434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24131794129920).

20431041400434 is an abundant number, since it is smaller than the sum of its proper divisors (27832546859406).

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

20431041400434 is a wasteful number, since it uses less digits than its factorization.

20431041400434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81344.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 20431041400434 its reverse (43400414013402), we get a palindrome (63831455413836).

The spelling of 20431041400434 in words is "twenty trillion, four hundred thirty-one billion, forty-one million, four hundred thousand, four hundred thirty-four".