20111711 has 2 divisors, whose sum is σ = 20111712. Its totient is φ = 20111710.

The previous prime is 20111687. The next prime is 20111783. The reversal of 20111711 is 11711102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111711 - 2¹⁰ = 20110687 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055855 + 10055856.

It is an arithmetic number, because the mean of its divisors is an integer number (10055856).

Almost surely, 2^20111711 is an apocalyptic number.

20111711 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111711 is an equidigital number, since it uses as much as digits as its factorization.

20111711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14, while the sum is 14.

The square root of 20111711 is about 4484.6082326107. The cubic root of 20111711 is about 271.9462074635.

Adding to 20111711 its reverse (11711102), we get a palindrome (31822813).

The spelling of 20111711 in words is "twenty million, one hundred eleven thousand, seven hundred eleven".