20523859 has 2 divisors, whose sum is σ = 20523860. Its totient is φ = 20523858.

The previous prime is 20523827. The next prime is 20523869. The reversal of 20523859 is 95832502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20523859 - 2⁵ = 20523827 is a prime.

It is not a weakly prime, because it can be changed into another prime (20523809) 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, 10261929 + 10261930.

It is an arithmetic number, because the mean of its divisors is an integer number (10261930).

Almost surely, 2^20523859 is an apocalyptic number.

20523859 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523859 is an equidigital number, since it uses as much as digits as its factorization.

20523859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 20523859 is about 4530.3265886689. The cubic root of 20523859 is about 273.7913190760.

The spelling of 20523859 in words is "twenty million, five hundred twenty-three thousand, eight hundred fifty-nine".