20181252 has 48 divisors (see below), whose sum is σ = 57959552. Its totient is φ = 5322240.

The previous prime is 20181247. The next prime is 20181311. The reversal of 20181252 is 25218102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8149 + ... + 10332.

Almost surely, 2^20181252 is an apocalyptic number.

It is an amenable number.

20181252 is an abundant number, since it is smaller than the sum of its proper divisors (37778300).

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

20181252 is a wasteful number, since it uses less digits than its factorization.

20181252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18508 (or 18506 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20181252 is about 4492.3548390571. The cubic root of 20181252 is about 272.2592863474.

Adding to 20181252 its reverse (25218102), we get a palindrome (45399354).

The spelling of 20181252 in words is "twenty million, one hundred eighty-one thousand, two hundred fifty-two".