20680487 has 2 divisors, whose sum is σ = 20680488. Its totient is φ = 20680486.

The previous prime is 20680453. The next prime is 20680489. The reversal of 20680487 is 78408602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20680487 - 2²⁴ = 3903271 is a prime.

Together with 20680489, 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 (20680489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10340243 + 10340244.

It is an arithmetic number, because the mean of its divisors is an integer number (10340244).

Almost surely, 2^20680487 is an apocalyptic number.

20680487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20680487 is an equidigital number, since it uses as much as digits as its factorization.

20680487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20680487 is about 4547.5803456344. The cubic root of 20680487 is about 274.4860350581.

The spelling of 20680487 in words is "twenty million, six hundred eighty thousand, four hundred eighty-seven".