20679964 has 12 divisors (see below), whose sum is σ = 36873144. Its totient is φ = 10144784.

The previous prime is 20679959. The next prime is 20679977. The reversal of 20679964 is 46997602.

It is a super-2 number, since 2×20679964² = 855321822082592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20679964.

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 in 3 ways as a sum of consecutive naturals, for example, 48562 + ... + 48985.

It is an arithmetic number, because the mean of its divisors is an integer number (3072762).

Almost surely, 2^20679964 is an apocalyptic number.

It is an amenable number.

20679964 is a deficient number, since it is larger than the sum of its proper divisors (16193180).

20679964 is a wasteful number, since it uses less digits than its factorization.

20679964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97604 (or 97602 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 20679964 is about 4547.5228421636. The cubic root of 20679964 is about 274.4837211634.

The spelling of 20679964 in words is "twenty million, six hundred seventy-nine thousand, nine hundred sixty-four".