20091679 has 2 divisors, whose sum is σ = 20091680. Its totient is φ = 20091678.

The previous prime is 20091677. The next prime is 20091691. The reversal of 20091679 is 97619002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20091679 - 2¹ = 20091677 is a prime.

Together with 20091677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20091677) 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, 10045839 + 10045840.

It is an arithmetic number, because the mean of its divisors is an integer number (10045840).

Almost surely, 2^20091679 is an apocalyptic number.

20091679 is a deficient number, since it is larger than the sum of its proper divisors (1).

20091679 is an equidigital number, since it uses as much as digits as its factorization.

20091679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 20091679 is about 4482.3742592515. The cubic root of 20091679 is about 271.8558880122.

The spelling of 20091679 in words is "twenty million, ninety-one thousand, six hundred seventy-nine".