20463979 has 2 divisors, whose sum is σ = 20463980. Its totient is φ = 20463978.

The previous prime is 20463953. The next prime is 20464009. The reversal of 20463979 is 97936402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20463979 - 2⁹ = 20463467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20461979) 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, 10231989 + 10231990.

It is an arithmetic number, because the mean of its divisors is an integer number (10231990).

Almost surely, 2^20463979 is an apocalyptic number.

20463979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20463979 is an equidigital number, since it uses as much as digits as its factorization.

20463979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 20463979 is about 4523.7129661374. The cubic root of 20463979 is about 273.5247903449.

The spelling of 20463979 in words is "twenty million, four hundred sixty-three thousand, nine hundred seventy-nine".