20389249 has 2 divisors, whose sum is σ = 20389250. Its totient is φ = 20389248.

The previous prime is 20389231. The next prime is 20389297. The reversal of 20389249 is 94298302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 5489649 = 3860^2 + 2343^2 .

It is a cyclic number.

It is not a de Polignac number, because 20389249 - 2⁵ = 20389217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20389219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194624 + 10194625.

It is an arithmetic number, because the mean of its divisors is an integer number (10194625).

Almost surely, 2^20389249 is an apocalyptic number.

It is an amenable number.

20389249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20389249 is an equidigital number, since it uses as much as digits as its factorization.

20389249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20389249 is about 4515.4456037029. The cubic root of 20389249 is about 273.1914332200.

The spelling of 20389249 in words is "twenty million, three hundred eighty-nine thousand, two hundred forty-nine".