20953811 has 2 divisors, whose sum is σ = 20953812. Its totient is φ = 20953810.

The previous prime is 20953717. The next prime is 20953819. The reversal of 20953811 is 11835902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20953811 - 2¹⁰ = 20952787 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 (20953819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476905 + 10476906.

It is an arithmetic number, because the mean of its divisors is an integer number (10476906).

Almost surely, 2^20953811 is an apocalyptic number.

20953811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20953811 is an equidigital number, since it uses as much as digits as its factorization.

20953811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 20953811 is about 4577.5332876998. The cubic root of 20953811 is about 275.6899962239.

The spelling of 20953811 in words is "twenty million, nine hundred fifty-three thousand, eight hundred eleven".