20004231440 has 40 divisors (see below), whose sum is σ = 46516194648. Its totient is φ = 8000599040.

The previous prime is 20004231421. The next prime is 20004231487. The reversal of 20004231440 is 4413240002.

It can be written as a sum of positive squares in 4 ways, for example, as 5278894336 + 14725337104 = 72656^2 + 121348^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837260 + ... + 860820.

Almost surely, 2^20004231440 is an apocalyptic number.

20004231440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20004231440 is an abundant number, since it is smaller than the sum of its proper divisors (26511963208).

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

20004231440 is a wasteful number, since it uses less digits than its factorization.

20004231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34187 (or 34181 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20004231440 its reverse (4413240002), we get a palindrome (24417471442).

The spelling of 20004231440 in words is "twenty billion, four million, two hundred thirty-one thousand, four hundred forty".