20123959 has 2 divisors, whose sum is σ = 20123960. Its totient is φ = 20123958.

The previous prime is 20123927. The next prime is 20124007. The reversal of 20123959 is 95932102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123959 - 2⁵ = 20123927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061979 + 10061980.

It is an arithmetic number, because the mean of its divisors is an integer number (10061980).

Almost surely, 2^20123959 is an apocalyptic number.

20123959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123959 is an equidigital number, since it uses as much as digits as its factorization.

20123959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20123959 is about 4485.9735844073. The cubic root of 20123959 is about 272.0014011966.

The spelling of 20123959 in words is "twenty million, one hundred twenty-three thousand, nine hundred fifty-nine".