20604811 has 2 divisors, whose sum is σ = 20604812. Its totient is φ = 20604810.

The previous prime is 20604809. The next prime is 20604823. The reversal of 20604811 is 11840602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20604811 - 2¹ = 20604809 is a prime.

Together with 20604809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20604011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302405 + 10302406.

It is an arithmetic number, because the mean of its divisors is an integer number (10302406).

Almost surely, 2^20604811 is an apocalyptic number.

20604811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604811 is an equidigital number, since it uses as much as digits as its factorization.

20604811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20604811 is about 4539.2522511973. The cubic root of 20604811 is about 274.1508173915.

The spelling of 20604811 in words is "twenty million, six hundred four thousand, eight hundred eleven".