204620120009 has 2 divisors, whose sum is σ = 204620120010. Its totient is φ = 204620120008.

The previous prime is 204620119967. The next prime is 204620120053. The reversal of 204620120009 is 900021026402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139574718409 + 65045401600 = 373597^2 + 255040^2 .

It is a cyclic number.

It is not a de Polignac number, because 204620120009 - 2¹⁶ = 204620054473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204620120009.

It is not a weakly prime, because it can be changed into another prime (204620125009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102310060004 + 102310060005.

It is an arithmetic number, because the mean of its divisors is an integer number (102310060005).

Almost surely, 2^204620120009 is an apocalyptic number.

It is an amenable number.

204620120009 is a deficient number, since it is larger than the sum of its proper divisors (1).

204620120009 is an equidigital number, since it uses as much as digits as its factorization.

204620120009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 204620120009 in words is "two hundred four billion, six hundred twenty million, one hundred twenty thousand, nine".