20668759 has 2 divisors, whose sum is σ = 20668760. Its totient is φ = 20668758.

The previous prime is 20668733. The next prime is 20668771. The reversal of 20668759 is 95786602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20668759 - 2⁵ = 20668727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20668799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10334379 + 10334380.

It is an arithmetic number, because the mean of its divisors is an integer number (10334380).

Almost surely, 2^20668759 is an apocalyptic number.

20668759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20668759 is an equidigital number, since it uses as much as digits as its factorization.

20668759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 20668759 is about 4546.2906858229. The cubic root of 20668759 is about 274.4341378123.

The spelling of 20668759 in words is "twenty million, six hundred sixty-eight thousand, seven hundred fifty-nine".