20710687 has 2 divisors, whose sum is σ = 20710688. Its totient is φ = 20710686.

The previous prime is 20710673. The next prime is 20710717. The reversal of 20710687 is 78601702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20710687 - 2⁷ = 20710559 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 (20710667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355343 + 10355344.

It is an arithmetic number, because the mean of its divisors is an integer number (10355344).

Almost surely, 2^20710687 is an apocalyptic number.

20710687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20710687 is an equidigital number, since it uses as much as digits as its factorization.

20710687 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 20710687 is about 4550.8995814015. The cubic root of 20710687 is about 274.6195819849.

The spelling of 20710687 in words is "twenty million, seven hundred ten thousand, six hundred eighty-seven".