20811611 has 2 divisors, whose sum is σ = 20811612. Its totient is φ = 20811610.

The previous prime is 20811569. The next prime is 20811653. The reversal of 20811611 is 11611802.

It is a balanced prime because it is at equal distance from previous prime (20811569) and next prime (20811653).

It is a cyclic number.

It is not a de Polignac number, because 20811611 - 2⁶ = 20811547 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20811691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405805 + 10405806.

It is an arithmetic number, because the mean of its divisors is an integer number (10405806).

Almost surely, 2^20811611 is an apocalyptic number.

20811611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20811611 is an equidigital number, since it uses as much as digits as its factorization.

20811611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 20811611 is about 4561.9744628834. The cubic root of 20811611 is about 275.0649367312.

The spelling of 20811611 in words is "twenty million, eight hundred eleven thousand, six hundred eleven".