20311161 has 16 divisors (see below), whose sum is σ = 29366400. Its totient is φ = 12412800.

The previous prime is 20311129. The next prime is 20311177. The reversal of 20311161 is 16111302.

It is not a de Polignac number, because 20311161 - 2⁵ = 20311129 is a prime.

It is a super-2 number, since 2×20311161² = 825086522335842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20311161.

It is not an unprimeable number, because it can be changed into a prime (20311111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4165 + ... + 7613.

It is an arithmetic number, because the mean of its divisors is an integer number (1835400).

Almost surely, 2^20311161 is an apocalyptic number.

It is an amenable number.

20311161 is a deficient number, since it is larger than the sum of its proper divisors (9055239).

20311161 is a wasteful number, since it uses less digits than its factorization.

20311161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20311161 is about 4506.7905431693. The cubic root of 20311161 is about 272.8422252486.

Adding to 20311161 its reverse (16111302), we get a palindrome (36422463).

The spelling of 20311161 in words is "twenty million, three hundred eleven thousand, one hundred sixty-one".