20731167 has 16 divisors (see below), whose sum is σ = 30784000. Its totient is φ = 13788792.

The previous prime is 20731163. The next prime is 20731187. The reversal of 20731167 is 76113702.

It is not a de Polignac number, because 20731167 - 2² = 20731163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20731167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731163) 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, 19434 + ... + 20472.

It is an arithmetic number, because the mean of its divisors is an integer number (1924000).

Almost surely, 2^20731167 is an apocalyptic number.

20731167 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20731167 is a deficient number, since it is larger than the sum of its proper divisors (10052833).

20731167 is a wasteful number, since it uses less digits than its factorization.

20731167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787 (or 1781 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20731167 is about 4553.1491299978. The cubic root of 20731167 is about 274.7100724034.

Adding to 20731167 its reverse (76113702), we get a palindrome (96844869).

It can be divided in two parts, 2073 and 1167, that added together give a triangular number (3240 = T₈₀).

The spelling of 20731167 in words is "twenty million, seven hundred thirty-one thousand, one hundred sixty-seven".