20311159 has 4 divisors (see below), whose sum is σ = 22157640. Its totient is φ = 18464680.

The previous prime is 20311129. The next prime is 20311177. The reversal of 20311159 is 95111302.

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 20311159 - 2¹³ = 20302967 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 (20311129) 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, 923224 + ... + 923245.

It is an arithmetic number, because the mean of its divisors is an integer number (5539410).

Almost surely, 2^20311159 is an apocalyptic number.

20311159 is a deficient number, since it is larger than the sum of its proper divisors (1846481).

20311159 is a wasteful number, since it uses less digits than its factorization.

20311159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846480.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 20311159 is about 4506.7903212819. The cubic root of 20311159 is about 272.8422162932.

The spelling of 20311159 in words is "twenty million, three hundred eleven thousand, one hundred fifty-nine".