20293243 has 4 divisors (see below), whose sum is σ = 20993040. Its totient is φ = 19593448.

The previous prime is 20293241. The next prime is 20293289. The reversal of 20293243 is 34239202.

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 20293243 - 2¹ = 20293241 is a prime.

It is a super-2 number, since 2×20293243² = 823631422914098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20293241) 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, 349855 + ... + 349912.

It is an arithmetic number, because the mean of its divisors is an integer number (5248260).

Almost surely, 2^20293243 is an apocalyptic number.

20293243 is a deficient number, since it is larger than the sum of its proper divisors (699797).

20293243 is an equidigital number, since it uses as much as digits as its factorization.

20293243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699796.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20293243 is about 4504.8022154141. The cubic root of 20293243 is about 272.7619701074.

The spelling of 20293243 in words is "twenty million, two hundred ninety-three thousand, two hundred forty-three".