20730587 has 2 divisors, whose sum is σ = 20730588. Its totient is φ = 20730586.

The previous prime is 20730571. The next prime is 20730607. The reversal of 20730587 is 78503702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20730587 - 2⁴ = 20730571 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20730187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365293 + 10365294.

It is an arithmetic number, because the mean of its divisors is an integer number (10365294).

Almost surely, 2^20730587 is an apocalyptic number.

20730587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730587 is an equidigital number, since it uses as much as digits as its factorization.

20730587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20730587 is about 4553.0854373710. The cubic root of 20730587 is about 274.7075105066.

The spelling of 20730587 in words is "twenty million, seven hundred thirty thousand, five hundred eighty-seven".