20764715 has 4 divisors (see below), whose sum is σ = 24917664. Its totient is φ = 16611768.

The previous prime is 20764703. The next prime is 20764717. The reversal of 20764715 is 51746702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20764715 - 2⁶ = 20764651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20764717) by changing a digit.

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, 2076467 + ... + 2076476.

It is an arithmetic number, because the mean of its divisors is an integer number (6229416).

Almost surely, 2^20764715 is an apocalyptic number.

20764715 is a deficient number, since it is larger than the sum of its proper divisors (4152949).

20764715 is an equidigital number, since it uses as much as digits as its factorization.

20764715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4152948.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20764715 is about 4556.8316844053. The cubic root of 20764715 is about 274.8581748032.

The spelling of 20764715 in words is "twenty million, seven hundred sixty-four thousand, seven hundred fifteen".