20320432820 has 48 divisors (see below), whose sum is σ = 44159472000. Its totient is φ = 7845210240.

The previous prime is 20320432813. The next prime is 20320432831. The reversal of 20320432820 is 2823402302.

It is a self number, because there is not a number n which added to its sum of digits gives 20320432820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2953985 + ... + 2960855.

It is an arithmetic number, because the mean of its divisors is an integer number (919989000).

Almost surely, 2^20320432820 is an apocalyptic number.

20320432820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320432820 is an abundant number, since it is smaller than the sum of its proper divisors (23839039180).

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

20320432820 is a wasteful number, since it uses less digits than its factorization.

20320432820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12008 (or 12006 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The spelling of 20320432820 in words is "twenty billion, three hundred twenty million, four hundred thirty-two thousand, eight hundred twenty".