20853541 has 2 divisors, whose sum is σ = 20853542. Its totient is φ = 20853540.

The previous prime is 20853529. The next prime is 20853557. The reversal of 20853541 is 14535802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 792100 = 4479^2 + 890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20853541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20853641) 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, 10426770 + 10426771.

It is an arithmetic number, because the mean of its divisors is an integer number (10426771).

Almost surely, 2^20853541 is an apocalyptic number.

It is an amenable number.

20853541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20853541 is an equidigital number, since it uses as much as digits as its factorization.

20853541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20853541 is about 4566.5677483204. The cubic root of 20853541 is about 275.2495409857.

The spelling of 20853541 in words is "twenty million, eight hundred fifty-three thousand, five hundred forty-one".