20027081 has 4 divisors (see below), whose sum is σ = 20717700. Its totient is φ = 19336464.

The previous prime is 20027069. The next prime is 20027087. The reversal of 20027081 is 18072002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12187081 + 7840000 = 3491^2 + 2800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20027081 is a prime.

It is a super-2 number, since 2×20027081² = 802167946761122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20027087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345266 + ... + 345323.

It is an arithmetic number, because the mean of its divisors is an integer number (5179425).

Almost surely, 2^20027081 is an apocalyptic number.

It is an amenable number.

20027081 is a deficient number, since it is larger than the sum of its proper divisors (690619).

20027081 is an equidigital number, since it uses as much as digits as its factorization.

20027081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690618.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 20027081 is about 4475.1626786073. The cubic root of 20027081 is about 271.5642216429.

Adding to 20027081 its reverse (18072002), we get a palindrome (38099083).

The spelling of 20027081 in words is "twenty million, twenty-seven thousand, eighty-one".