20026181 has 4 divisors (see below), whose sum is σ = 22887072. Its totient is φ = 17165292.

The previous prime is 20026177. The next prime is 20026207. The reversal of 20026181 is 18162002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18162002 = 2 ⋅9081001.

It is a cyclic number.

It is not a de Polignac number, because 20026181 - 2² = 20026177 is a prime.

It is a super-2 number, since 2×20026181² = 802095850889522, 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 (20026121) 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 3 ways as a sum of consecutive naturals, for example, 1430435 + ... + 1430448.

It is an arithmetic number, because the mean of its divisors is an integer number (5721768).

Almost surely, 2^20026181 is an apocalyptic number.

It is an amenable number.

20026181 is a deficient number, since it is larger than the sum of its proper divisors (2860891).

20026181 is an equidigital number, since it uses as much as digits as its factorization.

20026181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860890.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20026181 is about 4475.0621224738. The cubic root of 20026181 is about 271.5601536269.

Adding to 20026181 its reverse (18162002), we get a palindrome (38188183).

The spelling of 20026181 in words is "twenty million, twenty-six thousand, one hundred eighty-one".