20528550 has 180 divisors, whose sum is σ = 67728180. Its totient is φ = 4445280.

The previous prime is 20528539. The next prime is 20528551. The reversal of 20528550 is 5582502.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528551) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 1080441 + ... + 1080459.

Almost surely, 2^20528550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20528550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33864090).

20528550 is an abundant number, since it is smaller than the sum of its proper divisors (47199630).

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

20528550 is a wasteful number, since it uses less digits than its factorization.

20528550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 36 counting only the distinct ones).

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

The square root of 20528550 is about 4530.8442921822. The cubic root of 20528550 is about 273.8121770319.

The spelling of 20528550 in words is "twenty million, five hundred twenty-eight thousand, five hundred fifty".