20655853 has 2 divisors, whose sum is σ = 20655854. Its totient is φ = 20655852.

The previous prime is 20655829. The next prime is 20655857. The reversal of 20655853 is 35855602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16957924 + 3697929 = 4118^2 + 1923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20655853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20655857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327926 + 10327927.

It is an arithmetic number, because the mean of its divisors is an integer number (10327927).

Almost surely, 2^20655853 is an apocalyptic number.

It is an amenable number.

20655853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20655853 is an equidigital number, since it uses as much as digits as its factorization.

20655853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 20655853 is about 4544.8710652779. The cubic root of 20655853 is about 274.3770051379.

The spelling of 20655853 in words is "twenty million, six hundred fifty-five thousand, eight hundred fifty-three".