20204430040 has 64 divisors (see below), whose sum is σ = 47481370560. Its totient is φ = 7723077120.

The previous prime is 20204430013. The next prime is 20204430061. The reversal of 20204430040 is 4003440202.

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, 1017810 + ... + 1037470.

It is an arithmetic number, because the mean of its divisors is an integer number (741896415).

Almost surely, 2^20204430040 is an apocalyptic number.

20204430040 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 20204430040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23740685280).

20204430040 is an abundant number, since it is smaller than the sum of its proper divisors (27276940520).

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

20204430040 is a wasteful number, since it uses less digits than its factorization.

20204430040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20812 (or 20808 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20204430040 its reverse (4003440202), we get a palindrome (24207870242).

The spelling of 20204430040 in words is "twenty billion, two hundred four million, four hundred thirty thousand, forty".