20001852 has 72 divisors (see below), whose sum is σ = 55240640. Its totient is φ = 6065280.

The previous prime is 20001847. The next prime is 20001853. The reversal of 20001852 is 25810002.

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 (20001853) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 36702 + ... + 37242.

Almost surely, 2^20001852 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 20001852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27620320).

20001852 is an abundant number, since it is smaller than the sum of its proper divisors (35238788).

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

20001852 is a wasteful number, since it uses less digits than its factorization.

20001852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20001852 is about 4472.3430101011. The cubic root of 20001852 is about 271.4501399033.

Adding to 20001852 its reverse (25810002), we get a palindrome (45811854).

The spelling of 20001852 in words is "twenty million, one thousand, eight hundred fifty-two".