20674081 has 4 divisors (see below), whose sum is σ = 21064212. Its totient is φ = 20283952.

The previous prime is 20674067. The next prime is 20674133. The reversal of 20674081 is 18047602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18047602 = 2 ⋅9023801.

It can be written as a sum of positive squares in 2 ways, for example, as 7102225 + 13571856 = 2665^2 + 3684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20674081 is a prime.

It is a super-2 number, since 2×20674081² = 854835250389122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20674021) 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 3 ways as a sum of consecutive naturals, for example, 194986 + ... + 195091.

It is an arithmetic number, because the mean of its divisors is an integer number (5266053).

Almost surely, 2^20674081 is an apocalyptic number.

It is an amenable number.

20674081 is a deficient number, since it is larger than the sum of its proper divisors (390131).

20674081 is an equidigital number, since it uses as much as digits as its factorization.

20674081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390130.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20674081 is about 4546.8759604810. The cubic root of 20674081 is about 274.4576904785.

The spelling of 20674081 in words is "twenty million, six hundred seventy-four thousand, eighty-one".