20575733779 has 2 divisors, whose sum is σ = 20575733780. Its totient is φ = 20575733778.

The previous prime is 20575733741. The next prime is 20575733803. The reversal of 20575733779 is 97733757502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20575733779 - 2¹³ = 20575725587 is a prime.

It is not a weakly prime, because it can be changed into another prime (20575733719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10287866889 + 10287866890.

It is an arithmetic number, because the mean of its divisors is an integer number (10287866890).

Almost surely, 2^20575733779 is an apocalyptic number.

20575733779 is a deficient number, since it is larger than the sum of its proper divisors (1).

20575733779 is an equidigital number, since it uses as much as digits as its factorization.

20575733779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9724050, while the sum is 55.

The spelling of 20575733779 in words is "twenty billion, five hundred seventy-five million, seven hundred thirty-three thousand, seven hundred seventy-nine".