20646338 has 4 divisors (see below), whose sum is σ = 30969510. Its totient is φ = 10323168.

The previous prime is 20646317. The next prime is 20646349. The reversal of 20646338 is 83364602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83364602 = 2 ⋅41682301.

It can be written as a sum of positive squares in only one way, i.e., 20403289 + 243049 = 4517^2 + 493^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161583 + ... + 5161586.

Almost surely, 2^20646338 is an apocalyptic number.

20646338 is a deficient number, since it is larger than the sum of its proper divisors (10323172).

20646338 is a wasteful number, since it uses less digits than its factorization.

20646338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10323171.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20646338 is about 4543.8241603302. The cubic root of 20646338 is about 274.3348686036.

The spelling of 20646338 in words is "twenty million, six hundred forty-six thousand, three hundred thirty-eight".