20378159 has 4 divisors (see below), whose sum is σ = 20401440. Its totient is φ = 20354880.

The previous prime is 20378153. The next prime is 20378167. The reversal of 20378159 is 95187302.

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 20378159 - 2⁴ = 20378143 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 (20378153) 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, 10274 + ... + 12095.

It is an arithmetic number, because the mean of its divisors is an integer number (5100360).

Almost surely, 2^20378159 is an apocalyptic number.

20378159 is a deficient number, since it is larger than the sum of its proper divisors (23281).

20378159 is an equidigital number, since it uses as much as digits as its factorization.

20378159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23280.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20378159 is about 4514.2174294112. The cubic root of 20378159 is about 273.1418933463.

The spelling of 20378159 in words is "twenty million, three hundred seventy-eight thousand, one hundred fifty-nine".