20520337 has 2 divisors, whose sum is σ = 20520338. Its totient is φ = 20520336.

The previous prime is 20520319. The next prime is 20520389. The reversal of 20520337 is 73302502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14561856 + 5958481 = 3816^2 + 2441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520337 - 2¹⁵ = 20487569 is a prime.

It is equal to p_1301485 and since 20520337 and 1301485 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20520307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260168 + 10260169.

It is an arithmetic number, because the mean of its divisors is an integer number (10260169).

Almost surely, 2^20520337 is an apocalyptic number.

It is an amenable number.

20520337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520337 is an equidigital number, since it uses as much as digits as its factorization.

20520337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 20520337 is about 4529.9378582934. The cubic root of 20520337 is about 273.7756568462.

Adding to 20520337 its reverse (73302502), we get a palindrome (93822839).

The spelling of 20520337 in words is "twenty million, five hundred twenty thousand, three hundred thirty-seven".