20432449 has 2 divisors, whose sum is σ = 20432450. Its totient is φ = 20432448.

The previous prime is 20432437. The next prime is 20432513. The reversal of 20432449 is 94423402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 2310400 = 4257^2 + 1520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20432449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20432149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10216224 + 10216225.

It is an arithmetic number, because the mean of its divisors is an integer number (10216225).

Almost surely, 2^20432449 is an apocalyptic number.

It is an amenable number.

20432449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432449 is an equidigital number, since it uses as much as digits as its factorization.

20432449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20432449 is about 4520.2266536093. The cubic root of 20432449 is about 273.3842398079.

The spelling of 20432449 in words is "twenty million, four hundred thirty-two thousand, four hundred forty-nine".