20456665 has 8 divisors (see below), whose sum is σ = 24696000. Its totient is φ = 16266672.

The previous prime is 20456651. The next prime is 20456669. The reversal of 20456665 is 56665402.

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 20456665 - 2⁷ = 20456537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20456665.

It is not an unprimeable number, because it can be changed into a prime (20456669) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11415 + ... + 13084.

It is an arithmetic number, because the mean of its divisors is an integer number (3087000).

Almost surely, 2^20456665 is an apocalyptic number.

It is an amenable number.

20456665 is a deficient number, since it is larger than the sum of its proper divisors (4239335).

20456665 is a wasteful number, since it uses less digits than its factorization.

20456665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24671.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 20456665 is about 4522.9044871631. The cubic root of 20456665 is about 273.4921997671.

The spelling of 20456665 in words is "twenty million, four hundred fifty-six thousand, six hundred sixty-five".