20671759 has 2 divisors, whose sum is σ = 20671760. Its totient is φ = 20671758.

The previous prime is 20671757. The next prime is 20671769. The reversal of 20671759 is 95717602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20671759 - 2¹ = 20671757 is a prime.

Together with 20671757, 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 (20671757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335879 + 10335880.

It is an arithmetic number, because the mean of its divisors is an integer number (10335880).

Almost surely, 2^20671759 is an apocalyptic number.

20671759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20671759 is an equidigital number, since it uses as much as digits as its factorization.

20671759 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 20671759 is about 4546.6206131587. The cubic root of 20671759 is about 274.4474148969.

The spelling of 20671759 in words is "twenty million, six hundred seventy-one thousand, seven hundred fifty-nine".