20503687 has 2 divisors, whose sum is σ = 20503688. Its totient is φ = 20503686.

The previous prime is 20503673. The next prime is 20503697. The reversal of 20503687 is 78630502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20503687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503627) 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, 10251843 + 10251844.

It is an arithmetic number, because the mean of its divisors is an integer number (10251844).

Almost surely, 2^20503687 is an apocalyptic number.

20503687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503687 is an equidigital number, since it uses as much as digits as its factorization.

20503687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20503687 is about 4528.0997117996. The cubic root of 20503687 is about 273.7015905169.

The spelling of 20503687 in words is "twenty million, five hundred three thousand, six hundred eighty-seven".