20312137 has 2 divisors, whose sum is σ = 20312138. Its totient is φ = 20312136.

The previous prime is 20312113. The next prime is 20312143. The reversal of 20312137 is 73121302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 8173881 = 3484^2 + 2859^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312137 - 2¹¹ = 20310089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20312147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156068 + 10156069.

It is an arithmetic number, because the mean of its divisors is an integer number (10156069).

Almost surely, 2^20312137 is an apocalyptic number.

It is an amenable number.

20312137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312137 is an equidigital number, since it uses as much as digits as its factorization.

20312137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20312137 is about 4506.8988229158. The cubic root of 20312137 is about 272.8465954197.

Adding to 20312137 its reverse (73121302), we get a palindrome (93433439).

It can be divided in two parts, 20312 and 137, that added together give a square (20449 = 143²).

The spelling of 20312137 in words is "twenty million, three hundred twelve thousand, one hundred thirty-seven".