20135250 has 128 divisors (see below), whose sum is σ = 59155200. Its totient is φ = 5054400.

The previous prime is 20135239. The next prime is 20135257. The reversal of 20135250 is 5253102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 128172 + ... + 128328.

It is an arithmetic number, because the mean of its divisors is an integer number (462150).

Almost surely, 2^20135250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20135250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29577600).

20135250 is an abundant number, since it is smaller than the sum of its proper divisors (39019950).

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

20135250 is a wasteful number, since it uses less digits than its factorization.

20135250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20135250 is about 4487.2318861409. The cubic root of 20135250 is about 272.0522625210.

Adding to 20135250 its reverse (5253102), we get a palindrome (25388352).

The spelling of 20135250 in words is "twenty million, one hundred thirty-five thousand, two hundred fifty".