20004425040 has 160 divisors (see below), whose sum is σ = 64564260480. Its totient is φ = 5117478912.

The previous prime is 20004425017. The next prime is 20004425059. The reversal of 20004425040 is 4052440002.

It is a junction number, because it is equal to n+sod(n) for n = 20004424998 and 20004425016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1083567 + ... + 1101873.

It is an arithmetic number, because the mean of its divisors is an integer number (403526628).

Almost surely, 2^20004425040 is an apocalyptic number.

20004425040 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 20004425040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32282130240).

20004425040 is an abundant number, since it is smaller than the sum of its proper divisors (44559835440).

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

20004425040 is a wasteful number, since it uses less digits than its factorization.

20004425040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18509 (or 18503 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

Adding to 20004425040 its reverse (4052440002), we get a palindrome (24056865042).

The spelling of 20004425040 in words is "twenty billion, four million, four hundred twenty-five thousand, forty".