20835249 has 4 divisors (see below), whose sum is σ = 27780336. Its totient is φ = 13890164.

The previous prime is 20835233. The next prime is 20835289. The reversal of 20835249 is 94253802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20835249 - 2⁴ = 20835233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20835209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3472539 + ... + 3472544.

It is an arithmetic number, because the mean of its divisors is an integer number (6945084).

Almost surely, 2^20835249 is an apocalyptic number.

It is an amenable number.

20835249 is a deficient number, since it is larger than the sum of its proper divisors (6945087).

20835249 is an equidigital number, since it uses as much as digits as its factorization.

20835249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945086.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 20835249 is about 4564.5644918218. The cubic root of 20835249 is about 275.1690376720.

The spelling of 20835249 in words is "twenty million, eight hundred thirty-five thousand, two hundred forty-nine".