20566997 has 8 divisors (see below), whose sum is σ = 22552992. Its totient is φ = 18600400.

The previous prime is 20566979. The next prime is 20566999. The reversal of 20566997 is 79966502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20566997 - 2²² = 16372693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2579 + ... + 6912.

It is an arithmetic number, because the mean of its divisors is an integer number (2819124).

Almost surely, 2^20566997 is an apocalyptic number.

It is an amenable number.

20566997 is a deficient number, since it is larger than the sum of its proper divisors (1985995).

20566997 is a wasteful number, since it uses less digits than its factorization.

20566997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9699.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 20566997 is about 4535.0851149675. The cubic root of 20566997 is about 273.9830072755.

The spelling of 20566997 in words is "twenty million, five hundred sixty-six thousand, nine hundred ninety-seven".