20346439 has 4 divisors (see below), whose sum is σ = 20819656. Its totient is φ = 19873224.

The previous prime is 20346437. The next prime is 20346451. The reversal of 20346439 is 93464302.

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

It is not a de Polignac number, because 20346439 - 2¹ = 20346437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20346439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20346437) 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, 236544 + ... + 236629.

It is an arithmetic number, because the mean of its divisors is an integer number (5204914).

Almost surely, 2^20346439 is an apocalyptic number.

20346439 is a deficient number, since it is larger than the sum of its proper divisors (473217).

20346439 is an equidigital number, since it uses as much as digits as its factorization.

20346439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473216.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 20346439 is about 4510.7027168724. The cubic root of 20346439 is about 273.0000983957. Note that the first 4 decimals are identical.

The spelling of 20346439 in words is "twenty million, three hundred forty-six thousand, four hundred thirty-nine".