20571252 has 48 divisors (see below), whose sum is σ = 52073280. Its totient is φ = 6283008.

The previous prime is 20571247. The next prime is 20571253. The reversal of 20571252 is 25217502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20571253) 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 15 ways as a sum of consecutive naturals, for example, 25024 + ... + 25832.

It is an arithmetic number, because the mean of its divisors is an integer number (1084860).

Almost surely, 2^20571252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20571252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26036640).

20571252 is an abundant number, since it is smaller than the sum of its proper divisors (31502028).

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

20571252 is a wasteful number, since it uses less digits than its factorization.

20571252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20571252 is about 4535.5542108986. The cubic root of 20571252 is about 274.0019002834.

Adding to 20571252 its reverse (25217502), we get a palindrome (45788754).

The spelling of 20571252 in words is "twenty million, five hundred seventy-one thousand, two hundred fifty-two".