20388811 has 2 divisors, whose sum is σ = 20388812. Its totient is φ = 20388810.

The previous prime is 20388803. The next prime is 20388817. The reversal of 20388811 is 11888302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20388811 - 2³ = 20388803 is a prime.

It is a super-2 number, since 2×20388811² = 831407227987442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20388817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194405 + 10194406.

It is an arithmetic number, because the mean of its divisors is an integer number (10194406).

Almost surely, 2^20388811 is an apocalyptic number.

20388811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20388811 is an equidigital number, since it uses as much as digits as its factorization.

20388811 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 20388811 is about 4515.3971032457. The cubic root of 20388811 is about 273.1894769814.

The spelling of 20388811 in words is "twenty million, three hundred eighty-eight thousand, eight hundred eleven".