20811883 has 2 divisors, whose sum is σ = 20811884. Its totient is φ = 20811882.

The previous prime is 20811853. The next prime is 20811899. The reversal of 20811883 is 38811802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20811883 - 2¹⁷ = 20680811 is a prime.

It is equal to p_1318819 and since 20811883 and 1318819 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20811823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405941 + 10405942.

It is an arithmetic number, because the mean of its divisors is an integer number (10405942).

Almost surely, 2^20811883 is an apocalyptic number.

20811883 is a deficient number, since it is larger than the sum of its proper divisors (1).

20811883 is an equidigital number, since it uses as much as digits as its factorization.

20811883 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 20811883 is about 4562.0042744390. The cubic root of 20811883 is about 275.0661350580.

The spelling of 20811883 in words is "twenty million, eight hundred eleven thousand, eight hundred eighty-three".