204020851 has 2 divisors, whose sum is σ = 204020852. Its totient is φ = 204020850.

The previous prime is 204020821. The next prime is 204020857. The reversal of 204020851 is 158020402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204020851 - 2⁵ = 204020819 is a prime.

It is not a weakly prime, because it can be changed into another prime (204020857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102010425 + 102010426.

It is an arithmetic number, because the mean of its divisors is an integer number (102010426).

Almost surely, 2^204020851 is an apocalyptic number.

204020851 is a deficient number, since it is larger than the sum of its proper divisors (1).

204020851 is an equidigital number, since it uses as much as digits as its factorization.

204020851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 204020851 is about 14283.5867694357. The cubic root of 204020851 is about 588.6965873684.

The spelling of 204020851 in words is "two hundred four million, twenty thousand, eight hundred fifty-one".