20320120434 has 64 divisors (see below), whose sum is σ = 43420188672. Its totient is φ = 6317472000.

The previous prime is 20320120397. The next prime is 20320120453. The reversal of 20320120434 is 43402102302.

It is a self number, because there is not a number n which added to its sum of digits gives 20320120434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7561039 + ... + 7563725.

It is an arithmetic number, because the mean of its divisors is an integer number (678440448).

Almost surely, 2^20320120434 is an apocalyptic number.

20320120434 is an abundant number, since it is smaller than the sum of its proper divisors (23100068238).

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

20320120434 is a wasteful number, since it uses less digits than its factorization.

20320120434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20320120434 its reverse (43402102302), we get a palindrome (63722222736).

The spelling of 20320120434 in words is "twenty billion, three hundred twenty million, one hundred twenty thousand, four hundred thirty-four".