20764907 has 4 divisors (see below), whose sum is σ = 20778576. Its totient is φ = 20751240.

The previous prime is 20764897. The next prime is 20764921. The reversal of 20764907 is 70946702.

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 20764907 - 2⁸ = 20764651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20764927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4223 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (5194644).

Almost surely, 2^20764907 is an apocalyptic number.

20764907 is a deficient number, since it is larger than the sum of its proper divisors (13669).

20764907 is a wasteful number, since it uses less digits than its factorization.

20764907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13668.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20764907 is about 4556.8527516258. The cubic root of 20764907 is about 274.8590219552.

The spelling of 20764907 in words is "twenty million, seven hundred sixty-four thousand, nine hundred seven".