20256249 has 8 divisors (see below), whose sum is σ = 29085952. Its totient is φ = 12465360.

The previous prime is 20256227. The next prime is 20256251. The reversal of 20256249 is 94265202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20256249 - 2⁵ = 20256217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20256149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259657 + ... + 259734.

It is an arithmetic number, because the mean of its divisors is an integer number (3635744).

Almost surely, 2^20256249 is an apocalyptic number.

It is an amenable number.

20256249 is a deficient number, since it is larger than the sum of its proper divisors (8829703).

20256249 is a wasteful number, since it uses less digits than its factorization.

20256249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519407.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20256249 is about 4500.6942797751. The cubic root of 20256249 is about 272.5961235390.

The spelling of 20256249 in words is "twenty million, two hundred fifty-six thousand, two hundred forty-nine".