20730187 has 2 divisors, whose sum is σ = 20730188. Its totient is φ = 20730186.

The previous prime is 20730173. The next prime is 20730217. The reversal of 20730187 is 78103702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20730187 - 2¹¹ = 20728139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20730167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365093 + 10365094.

It is an arithmetic number, because the mean of its divisors is an integer number (10365094).

Almost surely, 2^20730187 is an apocalyptic number.

20730187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730187 is an equidigital number, since it uses as much as digits as its factorization.

20730187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20730187 is about 4553.0415109024. The cubic root of 20730187 is about 274.7057436534.

Adding to 20730187 its reverse (78103702), we get a palindrome (98833889).

The spelling of 20730187 in words is "twenty million, seven hundred thirty thousand, one hundred eighty-seven".