20492289 has 6 divisors (see below), whose sum is σ = 29599986. Its totient is φ = 13661520.

The previous prime is 20492273. The next prime is 20492321. The reversal of 20492289 is 98229402.

It can be written as a sum of positive squares in only one way, i.e., 16524225 + 3968064 = 4065^2 + 1992^2 .

It is not a de Polignac number, because 20492289 - 2⁴ = 20492273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20492239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1138452 + ... + 1138469.

It is an arithmetic number, because the mean of its divisors is an integer number (4933331).

Almost surely, 2^20492289 is an apocalyptic number.

It is an amenable number.

20492289 is a deficient number, since it is larger than the sum of its proper divisors (9107697).

20492289 is a wasteful number, since it uses less digits than its factorization.

20492289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276927 (or 2276924 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20492289 is about 4526.8409514804. The cubic root of 20492289 is about 273.6508642096.

The spelling of 20492289 in words is "twenty million, four hundred ninety-two thousand, two hundred eighty-nine".