20552 has 16 divisors (see below), whose sum is σ = 44160. Its totient is φ = 8784.

The previous prime is 20551. The next prime is 20563. The reversal of 20552 is 25502.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128 + ... + 239.

It is an arithmetic number, because the mean of its divisors is an integer number (2760).

2²⁰⁵⁵² is an apocalyptic number.

It is an amenable number.

20552 is an abundant number, since it is smaller than the sum of its proper divisors (23608).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22080).

20552 is a wasteful number, since it uses less digits than its factorization.

20552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 20552 is about 143.3596874997. The cubic root of 20552 is about 27.3916396963.

Subtracting 20552 from its reverse (25502), we obtain a triangular number (4950 = T₉₉).

The spelling of 20552 in words is "twenty thousand, five hundred fifty-two".