20557050 has 48 divisors (see below), whose sum is σ = 53672160. Its totient is φ = 5192640.

The previous prime is 20557039. The next prime is 20557051. The reversal of 20557050 is 5075502.

It is a self number, because there is not a number n which added to its sum of digits gives 20557050.

It is not an unprimeable number, because it can be changed into a prime (20557051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 757 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (1118170).

Almost surely, 2^20557050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20557050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26836080).

20557050 is an abundant number, since it is smaller than the sum of its proper divisors (33115110).

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

20557050 is a wasteful number, since it uses less digits than its factorization.

20557050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247 (or 7242 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 24.

The square root of 20557050 is about 4533.9883105275. The cubic root of 20557050 is about 273.9388305386.

The spelling of 20557050 in words is "twenty million, five hundred fifty-seven thousand, fifty".