20404249 has 2 divisors, whose sum is σ = 20404250. Its totient is φ = 20404248.

The previous prime is 20404213. The next prime is 20404261. The reversal of 20404249 is 94240402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13286025 + 7118224 = 3645^2 + 2668^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404249 - 2¹¹ = 20402201 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202124 + 10202125.

It is an arithmetic number, because the mean of its divisors is an integer number (10202125).

Almost surely, 2^20404249 is an apocalyptic number.

It is an amenable number.

20404249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404249 is an equidigital number, since it uses as much as digits as its factorization.

20404249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20404249 is about 4517.1062639703. The cubic root of 20404249 is about 273.2584107890.

The spelling of 20404249 in words is "twenty million, four hundred four thousand, two hundred forty-nine".