20523888 has 160 divisors (see below), whose sum is σ = 73566720. Its totient is φ = 5322240.

The previous prime is 20523887. The next prime is 20523911. The reversal of 20523888 is 88832502.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523887) 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, 32956 + ... + 33572.

It is an arithmetic number, because the mean of its divisors is an integer number (459792).

Almost surely, 2^20523888 is an apocalyptic number.

20523888 is a gapful number since it is divisible by the number (28) 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 20523888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36783360).

20523888 is an abundant number, since it is smaller than the sum of its proper divisors (53042832).

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

20523888 is a wasteful number, since it uses less digits than its factorization.

20523888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 20523888 is about 4530.3297893200. The cubic root of 20523888 is about 273.7914480307.

The spelling of 20523888 in words is "twenty million, five hundred twenty-three thousand, eight hundred eighty-eight".