20032425640 has 64 divisors (see below), whose sum is σ = 45769536000. Its totient is φ = 7889441280.

The previous prime is 20032425577. The next prime is 20032425653. The reversal of 20032425640 is 4652423002.

It is a junction number, because it is equal to n+sod(n) for n = 20032425599 and 20032425608.

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, 2293201 + ... + 2301919.

It is an arithmetic number, because the mean of its divisors is an integer number (715149000).

Almost surely, 2^20032425640 is an apocalyptic number.

20032425640 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 20032425640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22884768000).

20032425640 is an abundant number, since it is smaller than the sum of its proper divisors (25737110360).

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

20032425640 is a wasteful number, since it uses less digits than its factorization.

20032425640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9610 (or 9606 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20032425640 its reverse (4652423002), we get a palindrome (24684848642).

The spelling of 20032425640 in words is "twenty billion, thirty-two million, four hundred twenty-five thousand, six hundred forty".