20577533687 has 2 divisors, whose sum is σ = 20577533688. Its totient is φ = 20577533686.

The previous prime is 20577533681. The next prime is 20577533689. The reversal of 20577533687 is 78633577502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20577533687 - 2⁶ = 20577533623 is a prime.

Together with 20577533689, 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 (20577533681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288766843 + 10288766844.

It is an arithmetic number, because the mean of its divisors is an integer number (10288766844).

Almost surely, 2^20577533687 is an apocalyptic number.

20577533687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20577533687 is an equidigital number, since it uses as much as digits as its factorization.

20577533687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7408800, while the sum is 53.

The spelling of 20577533687 in words is "twenty billion, five hundred seventy-seven million, five hundred thirty-three thousand, six hundred eighty-seven".