20066687 has 2 divisors, whose sum is σ = 20066688. Its totient is φ = 20066686.

The previous prime is 20066639. The next prime is 20066689. The reversal of 20066687 is 78666002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20066687 - 2⁶ = 20066623 is a prime.

Together with 20066689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20066689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10033343 + 10033344.

It is an arithmetic number, because the mean of its divisors is an integer number (10033344).

Almost surely, 2^20066687 is an apocalyptic number.

20066687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20066687 is an equidigital number, since it uses as much as digits as its factorization.

20066687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20066687 is about 4479.5855835110. The cubic root of 20066687 is about 271.7431209075.

The spelling of 20066687 in words is "twenty million, sixty-six thousand, six hundred eighty-seven".