20519959 has 2 divisors, whose sum is σ = 20519960. Its totient is φ = 20519958.

The previous prime is 20519951. The next prime is 20519977. The reversal of 20519959 is 95991502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20519959 - 2³ = 20519951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20519951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10259979 + 10259980.

It is an arithmetic number, because the mean of its divisors is an integer number (10259980).

Almost surely, 2^20519959 is an apocalyptic number.

20519959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20519959 is an equidigital number, since it uses as much as digits as its factorization.

20519959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 20519959 is about 4529.8961356746. The cubic root of 20519959 is about 273.7739757849.

It can be divided in two parts, 205 and 19959, that added together give a square (20164 = 142²).

The spelling of 20519959 in words is "twenty million, five hundred nineteen thousand, nine hundred fifty-nine".