20433409 has 2 divisors, whose sum is σ = 20433410. Its totient is φ = 20433408.

The previous prime is 20433403. The next prime is 20433437. The reversal of 20433409 is 90433402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 138384 = 4505^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 20433409 - 2⁵ = 20433377 is a prime.

It is a super-2 number, since 2×20433409² = 835048406722562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20433403) 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, 10216704 + 10216705.

It is an arithmetic number, because the mean of its divisors is an integer number (10216705).

Almost surely, 2^20433409 is an apocalyptic number.

It is an amenable number.

20433409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20433409 is an equidigital number, since it uses as much as digits as its factorization.

20433409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20433409 is about 4520.3328417275. The cubic root of 20433409 is about 273.3885213106.

The spelling of 20433409 in words is "twenty million, four hundred thirty-three thousand, four hundred nine".