20667056 has 10 divisors (see below), whose sum is σ = 40042452. Its totient is φ = 10333520.

The previous prime is 20667043. The next prime is 20667061. The reversal of 20667056 is 65076602.

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, 645830 + ... + 645861.

Almost surely, 2^20667056 is an apocalyptic number.

It is an amenable number.

20667056 is a deficient number, since it is larger than the sum of its proper divisors (19375396).

20667056 is a wasteful number, since it uses less digits than its factorization.

20667056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291699 (or 1291693 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20667056 is about 4546.1033864179. The cubic root of 20667056 is about 274.4266002823.

The spelling of 20667056 in words is "twenty million, six hundred sixty-seven thousand, fifty-six".