20731037 has 8 divisors (see below), whose sum is σ = 21166200. Its totient is φ = 20300544.

The previous prime is 20731001. The next prime is 20731043. The reversal of 20731037 is 73013702.

It can be written as a sum of positive squares in 4 ways, for example, as 37636 + 20693401 = 194^2 + 4549^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20731037 - 2⁸ = 20730781 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 (20731057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8633 + ... + 10769.

It is an arithmetic number, because the mean of its divisors is an integer number (2645775).

Almost surely, 2^20731037 is an apocalyptic number.

It is an amenable number.

20731037 is a deficient number, since it is larger than the sum of its proper divisors (435163).

20731037 is a wasteful number, since it uses less digits than its factorization.

20731037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 20731037 is about 4553.1348541417. The cubic root of 20731037 is about 274.7094981893.

Adding to 20731037 its reverse (73013702), we get a palindrome (93744739).

It can be divided in two parts, 2073 and 1037, that multiplied together give a triangular number (2149701 = T₂₀₇₃).

The spelling of 20731037 in words is "twenty million, seven hundred thirty-one thousand, thirty-seven".