20207813 has 2 divisors, whose sum is σ = 20207814. Its totient is φ = 20207812.

The previous prime is 20207801. The next prime is 20207819. The reversal of 20207813 is 31870202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 289444 = 4463^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 20207813 - 2⁶ = 20207749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20207819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103906 + 10103907.

It is an arithmetic number, because the mean of its divisors is an integer number (10103907).

Almost surely, 2^20207813 is an apocalyptic number.

It is an amenable number.

20207813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20207813 is an equidigital number, since it uses as much as digits as its factorization.

20207813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20207813 is about 4495.3101116608. The cubic root of 20207813 is about 272.3786761771.

The spelling of 20207813 in words is "twenty million, two hundred seven thousand, eight hundred thirteen".