20679907 has 4 divisors (see below), whose sum is σ = 20716696. Its totient is φ = 20643120.

The previous prime is 20679877. The next prime is 20679959. The reversal of 20679907 is 70997602.

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 20679907 - 2⁷ = 20679779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20679907.

It is not an unprimeable number, because it can be changed into a prime (20679977) 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, 17538 + ... + 18679.

It is an arithmetic number, because the mean of its divisors is an integer number (5179174).

Almost surely, 2^20679907 is an apocalyptic number.

20679907 is a deficient number, since it is larger than the sum of its proper divisors (36789).

20679907 is an equidigital number, since it uses as much as digits as its factorization.

20679907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36788.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 20679907 is about 4547.5165750110. The cubic root of 20679907 is about 274.4834689775.

The spelling of 20679907 in words is "twenty million, six hundred seventy-nine thousand, nine hundred seven".