20129579 has 2 divisors, whose sum is σ = 20129580. Its totient is φ = 20129578.

The previous prime is 20129533. The next prime is 20129587. The reversal of 20129579 is 97592102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20129579 - 2²⁰ = 19081003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20129779) 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, 10064789 + 10064790.

It is an arithmetic number, because the mean of its divisors is an integer number (10064790).

Almost surely, 2^20129579 is an apocalyptic number.

20129579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20129579 is an equidigital number, since it uses as much as digits as its factorization.

20129579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 20129579 is about 4486.5999375919. The cubic root of 20129579 is about 272.0267193691.

The spelling of 20129579 in words is "twenty million, one hundred twenty-nine thousand, five hundred seventy-nine".