20730887 has 2 divisors, whose sum is σ = 20730888. Its totient is φ = 20730886.

The previous prime is 20730869. The next prime is 20730893. The reversal of 20730887 is 78803702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20730887 - 2⁶ = 20730823 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365443 + 10365444.

It is an arithmetic number, because the mean of its divisors is an integer number (10365444).

Almost surely, 2^20730887 is an apocalyptic number.

20730887 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730887 is an equidigital number, since it uses as much as digits as its factorization.

20730887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20730887 is about 4553.1183819444. The cubic root of 20730887 is about 274.7088356316.

The spelling of 20730887 in words is "twenty million, seven hundred thirty thousand, eight hundred eighty-seven".