20674789 has 8 divisors (see below), whose sum is σ = 21017880. Its totient is φ = 20334336.

The previous prime is 20674781. The next prime is 20674811. The reversal of 20674789 is 98747602.

It can be written as a sum of positive squares in 4 ways, for example, as 1464100 + 19210689 = 1210^2 + 4383^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20674789 - 2³ = 20674781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20674781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20239 + ... + 21235.

It is an arithmetic number, because the mean of its divisors is an integer number (2627235).

Almost surely, 2^20674789 is an apocalyptic number.

It is an amenable number.

20674789 is a deficient number, since it is larger than the sum of its proper divisors (343091).

20674789 is an equidigital number, since it uses as much as digits as its factorization.

20674789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20674789 is about 4546.9538154681. The cubic root of 20674789 is about 274.4608234485.

The spelling of 20674789 in words is "twenty million, six hundred seventy-four thousand, seven hundred eighty-nine".