20085979 has 2 divisors, whose sum is σ = 20085980. Its totient is φ = 20085978.

The previous prime is 20085973. The next prime is 20086007. The reversal of 20085979 is 97958002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20085979 - 2⁷ = 20085851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20085973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042989 + 10042990.

It is an arithmetic number, because the mean of its divisors is an integer number (10042990).

Almost surely, 2^20085979 is an apocalyptic number.

20085979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085979 is an equidigital number, since it uses as much as digits as its factorization.

20085979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 20085979 is about 4481.7383904017. The cubic root of 20085979 is about 271.8301771176.

The spelling of 20085979 in words is "twenty million, eighty-five thousand, nine hundred seventy-nine".