20577050821 has 2 divisors, whose sum is σ = 20577050822. Its totient is φ = 20577050820.

The previous prime is 20577050803. The next prime is 20577050839. The reversal of 20577050821 is 12805077502.

It is a balanced prime because it is at equal distance from previous prime (20577050803) and next prime (20577050839).

It can be written as a sum of positive squares in only one way, i.e., 20570730625 + 6320196 = 143425^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 20577050821 - 2⁹ = 20577050309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20577050861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288525410 + 10288525411.

It is an arithmetic number, because the mean of its divisors is an integer number (10288525411).

Almost surely, 2^20577050821 is an apocalyptic number.

It is an amenable number.

20577050821 is a deficient number, since it is larger than the sum of its proper divisors (1).

20577050821 is an equidigital number, since it uses as much as digits as its factorization.

20577050821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39200, while the sum is 37.

The spelling of 20577050821 in words is "twenty billion, five hundred seventy-seven million, fifty thousand, eight hundred twenty-one".