20506337 has 2 divisors, whose sum is σ = 20506338. Its totient is φ = 20506336.

The previous prime is 20506331. The next prime is 20506349. The reversal of 20506337 is 73360502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 355216 = 4489^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 20506337 - 2⁸ = 20506081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20506331) 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, 10253168 + 10253169.

It is an arithmetic number, because the mean of its divisors is an integer number (10253169).

Almost surely, 2^20506337 is an apocalyptic number.

It is an amenable number.

20506337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506337 is an equidigital number, since it uses as much as digits as its factorization.

20506337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 20506337 is about 4528.3923195766. The cubic root of 20506337 is about 273.7133815339.

Adding to 20506337 its reverse (73360502), we get a palindrome (93866839).

The spelling of 20506337 in words is "twenty million, five hundred six thousand, three hundred thirty-seven".