20285550 has 72 divisors (see below), whose sum is σ = 55468920. Its totient is φ = 5313600.

The previous prime is 20285549. The next prime is 20285561. The reversal of 20285550 is 5558202.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 27081 + ... + 27819.

Almost surely, 2^20285550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20285550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27734460).

20285550 is an abundant number, since it is smaller than the sum of its proper divisors (35183370).

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

20285550 is a wasteful number, since it uses less digits than its factorization.

20285550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 20285550 is about 4503.9482679089. The cubic root of 20285550 is about 272.7274984847.

The spelling of 20285550 in words is "twenty million, two hundred eighty-five thousand, five hundred fifty".