20597887520 has 192 divisors, whose sum is σ = 57205564416. Its totient is φ = 6861818880.

The previous prime is 20597887489. The next prime is 20597887523. The reversal of 20597887520 is 2578879502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20597887523) 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, 10160747 + ... + 10162773.

It is an arithmetic number, because the mean of its divisors is an integer number (297945648).

Almost surely, 2^20597887520 is an apocalyptic number.

20597887520 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 20597887520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28602782208).

20597887520 is an abundant number, since it is smaller than the sum of its proper divisors (36607676896).

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

20597887520 is a wasteful number, since it uses less digits than its factorization.

20597887520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 53.

The spelling of 20597887520 in words is "twenty billion, five hundred ninety-seven million, eight hundred eighty-seven thousand, five hundred twenty".