20671834 has 4 divisors (see below), whose sum is σ = 31007754. Its totient is φ = 10335916.

The previous prime is 20671817. The next prime is 20671873. The reversal of 20671834 is 43817602.

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

It can be written as a sum of positive squares in only one way, i.e., 13300609 + 7371225 = 3647^2 + 2715^2 .

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 junction number, because it is equal to n+sod(n) for n = 20671796 and 20671805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5167957 + ... + 5167960.

Almost surely, 2^20671834 is an apocalyptic number.

20671834 is a deficient number, since it is larger than the sum of its proper divisors (10335920).

20671834 is a wasteful number, since it uses less digits than its factorization.

20671834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335919.

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

The square root of 20671834 is about 4546.6288610354. The cubic root of 20671834 is about 274.4477468076.

The spelling of 20671834 in words is "twenty million, six hundred seventy-one thousand, eight hundred thirty-four".