20638807 has 16 divisors (see below), whose sum is σ = 25689600. Its totient is φ = 16178400.

The previous prime is 20638789. The next prime is 20638811. The reversal of 20638807 is 70883602.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20638807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182 + ... + 6532.

It is an arithmetic number, because the mean of its divisors is an integer number (1605600).

Almost surely, 2^20638807 is an apocalyptic number.

20638807 is a deficient number, since it is larger than the sum of its proper divisors (5050793).

20638807 is a wasteful number, since it uses less digits than its factorization.

20638807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5406.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20638807 is about 4542.9953775015. The cubic root of 20638807 is about 274.3015089000.

The spelling of 20638807 in words is "twenty million, six hundred thirty-eight thousand, eight hundred seven".