20002439 has 4 divisors (see below), whose sum is σ = 20467656. Its totient is φ = 19537224.

The previous prime is 20002429. The next prime is 20002453. The reversal of 20002439 is 93420002.

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-20002439 is a prime.

20002439 is a modest number, since divided by 2439 gives 200 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 20002439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002429) 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, 232544 + ... + 232629.

It is an arithmetic number, because the mean of its divisors is an integer number (5116914).

Almost surely, 2^20002439 is an apocalyptic number.

20002439 is a deficient number, since it is larger than the sum of its proper divisors (465217).

20002439 is an equidigital number, since it uses as much as digits as its factorization.

20002439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465216.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20002439 is about 4472.4086351764. The cubic root of 20002439 is about 271.4527953186.

It can be divided in two parts, 20002 and 439, that multiplied together give a palindrome (8780878).

The spelling of 20002439 in words is "twenty million, two thousand, four hundred thirty-nine".