20331003440 has 80 divisors (see below), whose sum is σ = 51783114240. Its totient is φ = 7362082560.

The previous prime is 20331003439. The next prime is 20331003487. The reversal of 20331003440 is 4430013302.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 15 ways as a sum of consecutive naturals, for example, 161987 + ... + 258653.

It is an arithmetic number, because the mean of its divisors is an integer number (647288928).

Almost surely, 2^20331003440 is an apocalyptic number.

20331003440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20331003440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25891557120).

20331003440 is an abundant number, since it is smaller than the sum of its proper divisors (31452110800).

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

20331003440 is a wasteful number, since it uses less digits than its factorization.

20331003440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96930 (or 96924 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20331003440 its reverse (4430013302), we get a palindrome (24761016742).

The spelling of 20331003440 in words is "twenty billion, three hundred thirty-one million, three thousand, four hundred forty".