20439343 has 4 divisors (see below), whose sum is σ = 20719408. Its totient is φ = 20159280.

The previous prime is 20439329. The next prime is 20439347. The reversal of 20439343 is 34393402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20439343 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 (20439347) 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, 139923 + ... + 140068.

It is an arithmetic number, because the mean of its divisors is an integer number (5179852).

Almost surely, 2^20439343 is an apocalyptic number.

20439343 is a deficient number, since it is larger than the sum of its proper divisors (280065).

20439343 is an equidigital number, since it uses as much as digits as its factorization.

20439343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280064.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 20439343 is about 4520.9891616769. The cubic root of 20439343 is about 273.4149833736.

The spelling of 20439343 in words is "twenty million, four hundred thirty-nine thousand, three hundred forty-three".