20311164 has 36 divisors (see below), whose sum is σ = 51500176. Its totient is φ = 6749568.

The previous prime is 20311129. The next prime is 20311177. The reversal of 20311164 is 46111302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14937 + ... + 16239.

Almost surely, 2^20311164 is an apocalyptic number.

It is an amenable number.

20311164 is an abundant number, since it is smaller than the sum of its proper divisors (31189012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311164 is a wasteful number, since it uses less digits than its factorization.

20311164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1741 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20311164 is about 4506.7908760003. The cubic root of 20311164 is about 272.8422386817.

Adding to 20311164 its reverse (46111302), we get a palindrome (66422466).

It can be divided in two parts, 2031116 and 4, that added together give a triangular number (2031120 = T₂₀₁₅).

The spelling of 20311164 in words is "twenty million, three hundred eleven thousand, one hundred sixty-four".