20406349 has 2 divisors, whose sum is σ = 20406350. Its totient is φ = 20406348.

The previous prime is 20406329. The next prime is 20406367. The reversal of 20406349 is 94360402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 7193124 = 3635^2 + 2682^2 .

It is a cyclic number.

It is not a de Polignac number, because 20406349 - 2⁹ = 20405837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20406329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203174 + 10203175.

It is an arithmetic number, because the mean of its divisors is an integer number (10203175).

Almost surely, 2^20406349 is an apocalyptic number.

It is an amenable number.

20406349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20406349 is an equidigital number, since it uses as much as digits as its factorization.

20406349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20406349 is about 4517.3387076906. The cubic root of 20406349 is about 273.2677850290.

The spelling of 20406349 in words is "twenty million, four hundred six thousand, three hundred forty-nine".