20853043 has 2 divisors, whose sum is σ = 20853044. Its totient is φ = 20853042.

The previous prime is 20853037. The next prime is 20853047. The reversal of 20853043 is 34035802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20853043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20852999 and 20853017.

It is not a weakly prime, because it can be changed into another prime (20853047) 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, 10426521 + 10426522.

It is an arithmetic number, because the mean of its divisors is an integer number (10426522).

Almost surely, 2^20853043 is an apocalyptic number.

20853043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853043 is an equidigital number, since it uses as much as digits as its factorization.

20853043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20853043 is about 4566.5132212663. The cubic root of 20853043 is about 275.2473499052.

Adding to 20853043 its reverse (34035802), we get a palindrome (54888845).

The spelling of 20853043 in words is "twenty million, eight hundred fifty-three thousand, forty-three".