20320344440 has 64 divisors (see below), whose sum is σ = 49892492160. Its totient is φ = 7386952320.

The previous prime is 20320344431. The next prime is 20320344467. The reversal of 20320344440 is 4444302302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2242559 + ... + 2251601.

It is an arithmetic number, because the mean of its divisors is an integer number (779570190).

Almost surely, 2^20320344440 is an apocalyptic number.

20320344440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320344440 is an abundant number, since it is smaller than the sum of its proper divisors (29572147720).

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

20320344440 is a wasteful number, since it uses less digits than its factorization.

20320344440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14172 (or 14168 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 20320344440 its reverse (4444302302), we get a palindrome (24764646742).

The spelling of 20320344440 in words is "twenty billion, three hundred twenty million, three hundred forty-four thousand, four hundred forty".