20849359 has 4 divisors (see below), whose sum is σ = 20912680. Its totient is φ = 20786040.

The previous prime is 20849321. The next prime is 20849399. The reversal of 20849359 is 95394802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20849359 - 2¹⁷ = 20718287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849399) 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, 31164 + ... + 31825.

It is an arithmetic number, because the mean of its divisors is an integer number (5228170).

Almost surely, 2^20849359 is an apocalyptic number.

20849359 is a deficient number, since it is larger than the sum of its proper divisors (63321).

20849359 is an equidigital number, since it uses as much as digits as its factorization.

20849359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63320.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 20849359 is about 4566.1098322314. The cubic root of 20849359 is about 275.2311401054.

The spelling of 20849359 in words is "twenty million, eight hundred forty-nine thousand, three hundred fifty-nine".