20318811 has 4 divisors (see below), whose sum is σ = 27091752. Its totient is φ = 13545872.

The previous prime is 20318807. The next prime is 20318813. The reversal of 20318811 is 11881302.

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 20318811 - 2² = 20318807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20318813) 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, 3386466 + ... + 3386471.

It is an arithmetic number, because the mean of its divisors is an integer number (6772938).

Almost surely, 2^20318811 is an apocalyptic number.

20318811 is a deficient number, since it is larger than the sum of its proper divisors (6772941).

20318811 is an equidigital number, since it uses as much as digits as its factorization.

20318811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772940.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 20318811 is about 4507.6391825433. The cubic root of 20318811 is about 272.8764754002.

The spelling of 20318811 in words is "twenty million, three hundred eighteen thousand, eight hundred eleven".