20520325540 has 96 divisors (see below), whose sum is σ = 51128340480. Its totient is φ = 6819648000.

The previous prime is 20520325523. The next prime is 20520325543. The reversal of 20520325540 is 4552302502.

It is a junction number, because it is equal to n+sod(n) for n = 20520325499 and 20520325508.

It is not an unprimeable number, because it can be changed into a prime (20520325543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253341 + ... + 324379.

It is an arithmetic number, because the mean of its divisors is an integer number (532586880).

Almost surely, 2^20520325540 is an apocalyptic number.

20520325540 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 20520325540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25564170240).

20520325540 is an abundant number, since it is smaller than the sum of its proper divisors (30608014940).

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

20520325540 is a wasteful number, since it uses less digits than its factorization.

20520325540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71173 (or 71171 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 28.

The spelling of 20520325540 in words is "twenty billion, five hundred twenty million, three hundred twenty-five thousand, five hundred forty".