20123159 has 4 divisors (see below), whose sum is σ = 22997904. Its totient is φ = 17248416.

The previous prime is 20123149. The next prime is 20123171. The reversal of 20123159 is 95132102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20123159 - 2⁴ = 20123143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437362 + ... + 1437375.

It is an arithmetic number, because the mean of its divisors is an integer number (5749476).

Almost surely, 2^20123159 is an apocalyptic number.

20123159 is a deficient number, since it is larger than the sum of its proper divisors (2874745).

20123159 is an equidigital number, since it uses as much as digits as its factorization.

20123159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874744.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20123159 is about 4485.8844167009. The cubic root of 20123159 is about 271.9977968031.

The spelling of 20123159 in words is "twenty million, one hundred twenty-three thousand, one hundred fifty-nine".