20312361 has 12 divisors (see below), whose sum is σ = 29386500. Its totient is φ = 13520160.

The previous prime is 20312359. The next prime is 20312393. The reversal of 20312361 is 16321302.

It can be written as a sum of positive squares in 2 ways, for example, as 3861225 + 16451136 = 1965^2 + 4056^2 .

It is not a de Polignac number, because 20312361 - 2¹ = 20312359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20312351) 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 11 ways as a sum of consecutive naturals, for example, 6015 + ... + 8763.

It is an arithmetic number, because the mean of its divisors is an integer number (2448875).

Almost surely, 2^20312361 is an apocalyptic number.

It is an amenable number.

20312361 is a deficient number, since it is larger than the sum of its proper divisors (9074139).

20312361 is a wasteful number, since it uses less digits than its factorization.

20312361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3573 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20312361 is about 4506.9236736382. The cubic root of 20312361 is about 272.8475983901.

Adding to 20312361 its reverse (16321302), we get a palindrome (36633663).

The spelling of 20312361 in words is "twenty million, three hundred twelve thousand, three hundred sixty-one".