20646268 has 6 divisors (see below), whose sum is σ = 36130976. Its totient is φ = 10323132.

The previous prime is 20646257. The next prime is 20646271. The reversal of 20646268 is 86264602.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2580780 + ... + 2580787.

Almost surely, 2^20646268 is an apocalyptic number.

It is an amenable number.

20646268 is a deficient number, since it is larger than the sum of its proper divisors (15484708).

20646268 is a wasteful number, since it uses less digits than its factorization.

20646268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161571 (or 5161569 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 20646268 is about 4543.8164575608. The cubic root of 20646268 is about 274.3345585654.

The spelling of 20646268 in words is "twenty million, six hundred forty-six thousand, two hundred sixty-eight".