20244409 has 2 divisors, whose sum is σ = 20244410. Its totient is φ = 20244408.

The previous prime is 20244397. The next prime is 20244431. The reversal of 20244409 is 90444202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15578809 + 4665600 = 3947^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 20244409 - 2¹⁷ = 20113337 is a prime.

It is equal to p_1285135 and since 20244409 and 1285135 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20244449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122204 + 10122205.

It is an arithmetic number, because the mean of its divisors is an integer number (10122205).

Almost surely, 2^20244409 is an apocalyptic number.

It is an amenable number.

20244409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244409 is an equidigital number, since it uses as much as digits as its factorization.

20244409 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20244409 is about 4499.3787348922. The cubic root of 20244409 is about 272.5430013782.

The spelling of 20244409 in words is "twenty million, two hundred forty-four thousand, four hundred nine".