20361409 has 2 divisors, whose sum is σ = 20361410. Its totient is φ = 20361408.

The previous prime is 20361401. The next prime is 20361413. The reversal of 20361409 is 90416302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14250625 + 6110784 = 3775^2 + 2472^2 .

It is a cyclic number.

It is not a de Polignac number, because 20361409 - 2³ = 20361401 is a prime.

It is not a weakly prime, because it can be changed into another prime (20361401) 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, 10180704 + 10180705.

It is an arithmetic number, because the mean of its divisors is an integer number (10180705).

Almost surely, 2^20361409 is an apocalyptic number.

It is an amenable number.

20361409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20361409 is an equidigital number, since it uses as much as digits as its factorization.

20361409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20361409 is about 4512.3617984377. The cubic root of 20361409 is about 273.0670357368.

The spelling of 20361409 in words is "twenty million, three hundred sixty-one thousand, four hundred nine".