204020023123979 has 2 divisors, whose sum is σ = 204020023123980. Its totient is φ = 204020023123978.

The previous prime is 204020023123913. The next prime is 204020023124009. The reversal of 204020023123979 is 979321320020402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204020023123979 - 2³² = 204015728156683 is a prime.

It is not a weakly prime, because it can be changed into another prime (204020023126979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102010011561989 + 102010011561990.

It is an arithmetic number, because the mean of its divisors is an integer number (102010011561990).

Almost surely, 2^{204020023123979} is an apocalyptic number.

204020023123979 is a deficient number, since it is larger than the sum of its proper divisors (1).

204020023123979 is an equidigital number, since it uses as much as digits as its factorization.

204020023123979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 204020023123979 in words is "two hundred four trillion, twenty billion, twenty-three million, one hundred twenty-three thousand, nine hundred seventy-nine".