20557006711 has 2 divisors, whose sum is σ = 20557006712. Its totient is φ = 20557006710.

The previous prime is 20557006643. The next prime is 20557006741. The reversal of 20557006711 is 11760075502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20557006711 - 2⁷ = 20557006583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20557006741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278503355 + 10278503356.

It is an arithmetic number, because the mean of its divisors is an integer number (10278503356).

Almost surely, 2^20557006711 is an apocalyptic number.

20557006711 is a deficient number, since it is larger than the sum of its proper divisors (1).

20557006711 is an equidigital number, since it uses as much as digits as its factorization.

20557006711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14700, while the sum is 34.

The spelling of 20557006711 in words is "twenty billion, five hundred fifty-seven million, six thousand, seven hundred eleven".