20670187 has 2 divisors, whose sum is σ = 20670188. Its totient is φ = 20670186.

The previous prime is 20670179. The next prime is 20670197. The reversal of 20670187 is 78107602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20670187 - 2³ = 20670179 is a prime.

It is a super-2 number, since 2×20670187² = 854513261229938, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20670137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335093 + 10335094.

It is an arithmetic number, because the mean of its divisors is an integer number (10335094).

Almost surely, 2^20670187 is an apocalyptic number.

20670187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670187 is an equidigital number, since it uses as much as digits as its factorization.

20670187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20670187 is about 4546.4477342206. The cubic root of 20670187 is about 274.4404578648.

Adding to 20670187 its reverse (78107602), we get a palindrome (98777789).

The spelling of 20670187 in words is "twenty million, six hundred seventy thousand, one hundred eighty-seven".