20508853 has 2 divisors, whose sum is σ = 20508854. Its totient is φ = 20508852.

The previous prime is 20508833. The next prime is 20508877. The reversal of 20508853 is 35880502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 7273809 = 3638^2 + 2697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20508853 is a prime.

It is a super-2 number, since 2×20508853² = 841226102751218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20508833) 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, 10254426 + 10254427.

It is an arithmetic number, because the mean of its divisors is an integer number (10254427).

Almost surely, 2^20508853 is an apocalyptic number.

It is an amenable number.

20508853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508853 is an equidigital number, since it uses as much as digits as its factorization.

20508853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 20508853 is about 4528.6701138414. The cubic root of 20508853 is about 273.7245753860.

The spelling of 20508853 in words is "twenty million, five hundred eight thousand, eight hundred fifty-three".