20508833 has 2 divisors, whose sum is σ = 20508834. Its totient is φ = 20508832.

The previous prime is 20508811. The next prime is 20508853. The reversal of 20508833 is 33880502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13017664 + 7491169 = 3608^2 + 2737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20508833 is a prime.

It is a super-2 number, since 2×20508833² = 841224462043778, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20508796 and 20508805.

It is not a weakly prime, because it can be changed into another prime (20508853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254416 + 10254417.

It is an arithmetic number, because the mean of its divisors is an integer number (10254417).

Almost surely, 2^20508833 is an apocalyptic number.

It is an amenable number.

20508833 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508833 is an equidigital number, since it uses as much as digits as its factorization.

20508833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20508833 is about 4528.6679056871. The cubic root of 20508833 is about 273.7244864082.

The spelling of 20508833 in words is "twenty million, five hundred eight thousand, eight hundred thirty-three".