20523360 has 288 divisors, whose sum is σ = 79688448. Its totient is φ = 4392960.

The previous prime is 20523343. The next prime is 20523361. The reversal of 20523360 is 6332502.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 892309 + ... + 892331.

It is an arithmetic number, because the mean of its divisors is an integer number (276696).

Almost surely, 2^20523360 is an apocalyptic number.

20523360 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 20523360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39844224).

20523360 is an abundant number, since it is smaller than the sum of its proper divisors (59165088).

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

20523360 is a wasteful number, since it uses less digits than its factorization.

20523360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20523360 is about 4530.2715150419. The cubic root of 20523360 is about 273.7891001467.

Adding to 20523360 its reverse (6332502), we get a palindrome (26855862).

The spelling of 20523360 in words is "twenty million, five hundred twenty-three thousand, three hundred sixty".