20523545440 has 96 divisors (see below), whose sum is σ = 49062150144. Its totient is φ = 8112545280.

The previous prime is 20523545423. The next prime is 20523545453. The reversal of 20523545440 is 4454532502.

It is a junction number, because it is equal to n+sod(n) for n = 20523545396 and 20523545405.

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, 5504857 + ... + 5508583.

It is an arithmetic number, because the mean of its divisors is an integer number (511064064).

Almost surely, 2^20523545440 is an apocalyptic number.

20523545440 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 20523545440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24531075072).

20523545440 is an abundant number, since it is smaller than the sum of its proper divisors (28538604704).

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

20523545440 is a wasteful number, since it uses less digits than its factorization.

20523545440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140 (or 4132 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 34.

The spelling of 20523545440 in words is "twenty billion, five hundred twenty-three million, five hundred forty-five thousand, four hundred forty".