20493243 has 10 divisors (see below), whose sum is σ = 30613484. Its totient is φ = 13662108.

The previous prime is 20493197. The next prime is 20493257. The reversal of 20493243 is 34239402.

It is a happy number.

It is not a de Polignac number, because 20493243 - 2¹⁶ = 20427707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20493293) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 126421 + ... + 126582.

Almost surely, 2^20493243 is an apocalyptic number.

20493243 is a deficient number, since it is larger than the sum of its proper divisors (10120241).

20493243 is an equidigital number, since it uses as much as digits as its factorization.

20493243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253015 (or 253006 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 20493243 is about 4526.9463217494. The cubic root of 20493243 is about 273.6551106667.

It can be divided in two parts, 20493 and 243, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20493243 in words is "twenty million, four hundred ninety-three thousand, two hundred forty-three".