20564995 has 8 divisors (see below), whose sum is σ = 26921520. Its totient is φ = 14956320.

The previous prime is 20564989. The next prime is 20565001. The reversal of 20564995 is 59946502.

It is an interprime number because it is at equal distance from previous prime (20564989) and next prime (20565001).

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

It is not a de Polignac number, because 20564995 - 2³ = 20564987 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 186900 + ... + 187009.

It is an arithmetic number, because the mean of its divisors is an integer number (3365190).

Almost surely, 2^20564995 is an apocalyptic number.

20564995 is a deficient number, since it is larger than the sum of its proper divisors (6356525).

20564995 is a wasteful number, since it uses less digits than its factorization.

20564995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373925.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 20564995 is about 4534.8643860649. The cubic root of 20564995 is about 273.9741171139.

The spelling of 20564995 in words is "twenty million, five hundred sixty-four thousand, nine hundred ninety-five".