20204347 has 4 divisors (see below), whose sum is σ = 21392856. Its totient is φ = 19015840.

The previous prime is 20204341. The next prime is 20204351. The reversal of 20204347 is 74340202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74340202 = 2 ⋅37170101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20204347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20204341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594229 + ... + 594262.

It is an arithmetic number, because the mean of its divisors is an integer number (5348214).

Almost surely, 2^20204347 is an apocalyptic number.

20204347 is a deficient number, since it is larger than the sum of its proper divisors (1188509).

20204347 is a wasteful number, since it uses less digits than its factorization.

20204347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188508.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20204347 is about 4494.9245822372. The cubic root of 20204347 is about 272.3631026879.

Adding to 20204347 its reverse (74340202), we get a palindrome (94544549).

The spelling of 20204347 in words is "twenty million, two hundred four thousand, three hundred forty-seven".