20500807 has 2 divisors, whose sum is σ = 20500808. Its totient is φ = 20500806.

The previous prime is 20500763. The next prime is 20500813. The reversal of 20500807 is 70800502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20500807 - 2⁷ = 20500679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250403 + 10250404.

It is an arithmetic number, because the mean of its divisors is an integer number (10250404).

Almost surely, 2^20500807 is an apocalyptic number.

20500807 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500807 is an equidigital number, since it uses as much as digits as its factorization.

20500807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20500807 is about 4527.7816864332. The cubic root of 20500807 is about 273.6887749764.

The spelling of 20500807 in words is "twenty million, five hundred thousand, eight hundred seven".