20455361 has 2 divisors, whose sum is σ = 20455362. Its totient is φ = 20455360.

The previous prime is 20455327. The next prime is 20455363. The reversal of 20455361 is 16355402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14205361 + 6250000 = 3769^2 + 2500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20455361 is a prime.

Together with 20455363, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20455361.

It is not a weakly prime, because it can be changed into another prime (20455363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227680 + 10227681.

It is an arithmetic number, because the mean of its divisors is an integer number (10227681).

Almost surely, 2^20455361 is an apocalyptic number.

It is an amenable number.

20455361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455361 is an equidigital number, since it uses as much as digits as its factorization.

20455361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20455361 is about 4522.7603297102. The cubic root of 20455361 is about 273.4863884352.

The spelling of 20455361 in words is "twenty million, four hundred fifty-five thousand, three hundred sixty-one".