20674813 has 4 divisors (see below), whose sum is σ = 20832768. Its totient is φ = 20516860.

The previous prime is 20674811. The next prime is 20674817. The reversal of 20674813 is 31847602.

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.

It is a cyclic number.

It is not a de Polignac number, because 20674813 - 2¹ = 20674811 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20674811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78781 + ... + 79042.

It is an arithmetic number, because the mean of its divisors is an integer number (5208192).

Almost surely, 2^20674813 is an apocalyptic number.

It is an amenable number.

20674813 is a deficient number, since it is larger than the sum of its proper divisors (157955).

20674813 is a wasteful number, since it uses less digits than its factorization.

20674813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157954.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20674813 is about 4546.9564545969. The cubic root of 20674813 is about 274.4609296496.

The spelling of 20674813 in words is "twenty million, six hundred seventy-four thousand, eight hundred thirteen".