20005432434 has 128 divisors (see below), whose sum is σ = 49380710400. Its totient is φ = 5965081920.

The previous prime is 20005432423. The next prime is 20005432439. The reversal of 20005432434 is 43423450002.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20005432398 and 20005432407.

It is not an unprimeable number, because it can be changed into a prime (20005432439) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2937277 + ... + 2944079.

It is an arithmetic number, because the mean of its divisors is an integer number (385786800).

Almost surely, 2^20005432434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20005432434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24690355200).

20005432434 is an abundant number, since it is smaller than the sum of its proper divisors (29375277966).

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

20005432434 is a wasteful number, since it uses less digits than its factorization.

20005432434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6957 (or 6951 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

Adding to 20005432434 its reverse (43423450002), we get a palindrome (63428882436).

The spelling of 20005432434 in words is "twenty billion, five million, four hundred thirty-two thousand, four hundred thirty-four".