20005440534 has 128 divisors (see below), whose sum is σ = 47245685760. Its totient is φ = 6265900800.

The previous prime is 20005440509. The next prime is 20005440551. The reversal of 20005440534 is 43504450002.

20005440534 is a `hidden beast` number, since 200 + 0 + 54 + 405 + 3 + 4 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20005440498 and 20005440507.

It is a congruent number.

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, 8436369 + ... + 8438739.

It is an arithmetic number, because the mean of its divisors is an integer number (369106920).

Almost surely, 2^20005440534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20005440534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23622842880).

20005440534 is an abundant number, since it is smaller than the sum of its proper divisors (27240245226).

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

20005440534 is a wasteful number, since it uses less digits than its factorization.

20005440534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 20005440534 its reverse (43504450002), we get a palindrome (63509890536).

The spelling of 20005440534 in words is "twenty billion, five million, four hundred forty thousand, five hundred thirty-four".