20700187 has 2 divisors, whose sum is σ = 20700188. Its totient is φ = 20700186.

The previous prime is 20700181. The next prime is 20700191. The reversal of 20700187 is 78100702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20700187 - 2⁷ = 20700059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20700181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350093 + 10350094.

It is an arithmetic number, because the mean of its divisors is an integer number (10350094).

Almost surely, 2^20700187 is an apocalyptic number.

20700187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20700187 is an equidigital number, since it uses as much as digits as its factorization.

20700187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20700187 is about 4549.7458170759. The cubic root of 20700187 is about 274.5731648373.

Adding to 20700187 its reverse (78100702), we get a palindrome (98800889).

The spelling of 20700187 in words is "twenty million, seven hundred thousand, one hundred eighty-seven".