20432609 has 2 divisors, whose sum is σ = 20432610. Its totient is φ = 20432608.

The previous prime is 20432597. The next prime is 20432663. The reversal of 20432609 is 90623402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 2209 = 4520^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 20432609 - 2²⁰ = 19384033 is a prime.

It is not a weakly prime, because it can be changed into another prime (20432669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216304 + 10216305.

It is an arithmetic number, because the mean of its divisors is an integer number (10216305).

Almost surely, 2^20432609 is an apocalyptic number.

It is an amenable number.

20432609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432609 is an equidigital number, since it uses as much as digits as its factorization.

20432609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20432609 is about 4520.2443518022. The cubic root of 20432609 is about 273.3849534010.

The spelling of 20432609 in words is "twenty million, four hundred thirty-two thousand, six hundred nine".