20425405040 has 80 divisors (see below), whose sum is σ = 48001615200. Its totient is φ = 8082410496.

The previous prime is 20425404977. The next prime is 20425405069. The reversal of 20425405040 is 4050452402.

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

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, 3255026 + ... + 3261294.

It is an arithmetic number, because the mean of its divisors is an integer number (600020190).

Almost surely, 2^20425405040 is an apocalyptic number.

20425405040 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 20425405040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24000807600).

20425405040 is an abundant number, since it is smaller than the sum of its proper divisors (27576210160).

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

20425405040 is a wasteful number, since it uses less digits than its factorization.

20425405040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6714 (or 6708 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

Adding to 20425405040 its reverse (4050452402), we get a palindrome (24475857442).

The spelling of 20425405040 in words is "twenty billion, four hundred twenty-five million, four hundred five thousand, forty".