20000181 has 8 divisors (see below), whose sum is σ = 26707360. Its totient is φ = 13313232.

The previous prime is 20000171. The next prime is 20000213. The reversal of 20000181 is 18100002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20000181 - 2¹³ = 19991989 is a prime.

It is a super-2 number, since 2×20000181² = 800014480065522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000161) 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 7 ways as a sum of consecutive naturals, for example, 2575 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (3338420).

Almost surely, 2^20000181 is an apocalyptic number.

It is an amenable number.

20000181 is a deficient number, since it is larger than the sum of its proper divisors (6707179).

20000181 is an equidigital number, since it uses as much as digits as its factorization.

20000181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 20000181 is about 4472.1561913690. The cubic root of 20000181 is about 271.4425805063.

Adding to 20000181 its reverse (18100002), we get a palindrome (38100183).

The spelling of 20000181 in words is "twenty million, one hundred eighty-one", and thus it is an aban number.