20725853 has 2 divisors, whose sum is σ = 20725854. Its totient is φ = 20725852.

The previous prime is 20725813. The next prime is 20725867. The reversal of 20725853 is 35852702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20457529 + 268324 = 4523^2 + 518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20725853 is a prime.

It is a super-3 number, since 3×20725853³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20725813) 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, 10362926 + 10362927.

It is an arithmetic number, because the mean of its divisors is an integer number (10362927).

Almost surely, 2^20725853 is an apocalyptic number.

It is an amenable number.

20725853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725853 is an equidigital number, since it uses as much as digits as its factorization.

20725853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20725853 is about 4552.5655404398. The cubic root of 20725853 is about 274.6865983418.

The spelling of 20725853 in words is "twenty million, seven hundred twenty-five thousand, eight hundred fifty-three".