20523880 has 64 divisors (see below), whose sum is σ = 51483600. Its totient is φ = 7311360.

The previous prime is 20523869. The next prime is 20523887. The reversal of 20523880 is 8832502.

It can be written as a sum of positive squares in 8 ways, for example, as 2427364 + 18096516 = 1558^2 + 4254^2 .

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 15 ways as a sum of consecutive naturals, for example, 14400 + ... + 15760.

Almost surely, 2^20523880 is an apocalyptic number.

20523880 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 20523880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25741800).

20523880 is an abundant number, since it is smaller than the sum of its proper divisors (30959720).

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

20523880 is a wasteful number, since it uses less digits than its factorization.

20523880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1410 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20523880 is about 4530.3289063820. The cubic root of 20523880 is about 273.7914124570.

The spelling of 20523880 in words is "twenty million, five hundred twenty-three thousand, eight hundred eighty".