20137331 has 2 divisors, whose sum is σ = 20137332. Its totient is φ = 20137330.

The previous prime is 20137309. The next prime is 20137357. The reversal of 20137331 is 13373102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20137331 is a prime.

It is a super-2 number, since 2×20137331² = 811024199607122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20137301) 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 as a sum of consecutive naturals, namely, 10068665 + 10068666.

It is an arithmetic number, because the mean of its divisors is an integer number (10068666).

Almost surely, 2^20137331 is an apocalyptic number.

20137331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20137331 is an equidigital number, since it uses as much as digits as its factorization.

20137331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 20137331 is about 4487.4637602994. The cubic root of 20137331 is about 272.0616344973.

The spelling of 20137331 in words is "twenty million, one hundred thirty-seven thousand, three hundred thirty-one".