20321066477 has 2 divisors, whose sum is σ = 20321066478. Its totient is φ = 20321066476.

The previous prime is 20321066473. The next prime is 20321066489. The reversal of 20321066477 is 77466012302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10843265161 + 9477801316 = 104131^2 + 97354^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321066477 - 2² = 20321066473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20321066477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321066473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160533238 + 10160533239.

It is an arithmetic number, because the mean of its divisors is an integer number (10160533239).

Almost surely, 2^20321066477 is an apocalyptic number.

It is an amenable number.

20321066477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321066477 is an equidigital number, since it uses as much as digits as its factorization.

20321066477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 38.

Adding to 20321066477 its reverse (77466012302), we get a palindrome (97787078779).

The spelling of 20321066477 in words is "twenty billion, three hundred twenty-one million, sixty-six thousand, four hundred seventy-seven".