20499293 has 4 divisors (see below), whose sum is σ = 20509500. Its totient is φ = 20489088.

The previous prime is 20499247. The next prime is 20499299. The reversal of 20499293 is 39299402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4153444 + 16345849 = 2038^2 + 4043^2 .

It is a cyclic number.

It is not a de Polignac number, because 20499293 - 2¹² = 20495197 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 (20499299) 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, 980 + ... + 6477.

It is an arithmetic number, because the mean of its divisors is an integer number (5127375).

Almost surely, 2^20499293 is an apocalyptic number.

It is an amenable number.

20499293 is a deficient number, since it is larger than the sum of its proper divisors (10207).

20499293 is an equidigital number, since it uses as much as digits as its factorization.

20499293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 20499293 is about 4527.6144933066. The cubic root of 20499293 is about 273.6820374367.

The spelling of 20499293 in words is "twenty million, four hundred ninety-nine thousand, two hundred ninety-three".