20759887 has 2 divisors, whose sum is σ = 20759888. Its totient is φ = 20759886.

The previous prime is 20759881. The next prime is 20759891. The reversal of 20759887 is 78895702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20759887 - 2¹⁹ = 20235599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20759881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10379943 + 10379944.

It is an arithmetic number, because the mean of its divisors is an integer number (10379944).

Almost surely, 2^20759887 is an apocalyptic number.

20759887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20759887 is an equidigital number, since it uses as much as digits as its factorization.

20759887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 20759887 is about 4556.3018995672. The cubic root of 20759887 is about 274.8368707444.

The spelling of 20759887 in words is "twenty million, seven hundred fifty-nine thousand, eight hundred eighty-seven".