20455213 has 2 divisors, whose sum is σ = 20455214. Its totient is φ = 20455212.

The previous prime is 20455207. The next prime is 20455219. The reversal of 20455213 is 31255402.

It is a balanced prime because it is at equal distance from previous prime (20455207) and next prime (20455219).

It can be written as a sum of positive squares in only one way, i.e., 12687844 + 7767369 = 3562^2 + 2787^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455213 - 2⁵ = 20455181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20455219) 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, 10227606 + 10227607.

It is an arithmetic number, because the mean of its divisors is an integer number (10227607).

Almost surely, 2^20455213 is an apocalyptic number.

It is an amenable number.

20455213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455213 is an equidigital number, since it uses as much as digits as its factorization.

20455213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20455213 is about 4522.7439679911. The cubic root of 20455213 is about 273.4857288513.

The spelling of 20455213 in words is "twenty million, four hundred fifty-five thousand, two hundred thirteen".