20646964 has 12 divisors (see below), whose sum is σ = 38911684. Its totient is φ = 9529344.

The previous prime is 20646949. The next prime is 20646973. The reversal of 20646964 is 46964602.

It can be written as a sum of positive squares in 2 ways, for example, as 5107600 + 15539364 = 2260^2 + 3942^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 198477 + ... + 198580.

Almost surely, 2^20646964 is an apocalyptic number.

It is an amenable number.

20646964 is a deficient number, since it is larger than the sum of its proper divisors (18264720).

20646964 is a wasteful number, since it uses less digits than its factorization.

20646964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397074 (or 397072 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 20646964 is about 4543.8930445159. The cubic root of 20646964 is about 274.3376412001.

The spelling of 20646964 in words is "twenty million, six hundred forty-six thousand, nine hundred sixty-four".