20660811 has 4 divisors (see below), whose sum is σ = 27547752. Its totient is φ = 13773872.

The previous prime is 20660779. The next prime is 20660813. The reversal of 20660811 is 11806602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20660811 - 2⁵ = 20660779 is a prime.

It is a super-2 number, since 2×20660811² = 853738222355442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20660813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443466 + ... + 3443471.

It is an arithmetic number, because the mean of its divisors is an integer number (6886938).

Almost surely, 2^20660811 is an apocalyptic number.

20660811 is a deficient number, since it is larger than the sum of its proper divisors (6886941).

20660811 is an equidigital number, since it uses as much as digits as its factorization.

20660811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6886940.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20660811 is about 4545.4164825679. The cubic root of 20660811 is about 274.3989561778.

The spelling of 20660811 in words is "twenty million, six hundred sixty thousand, eight hundred eleven".