20354204239 has 4 divisors (see below), whose sum is σ = 20438661760. Its totient is φ = 20269746720.

The previous prime is 20354204237. The next prime is 20354204251. The reversal of 20354204239 is 93240245302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93240245302 = 2 ⋅46620122651.

It is a cyclic number.

It is not a de Polignac number, because 20354204239 - 2¹ = 20354204237 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 (20354204237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42228399 + ... + 42228880.

It is an arithmetic number, because the mean of its divisors is an integer number (5109665440).

Almost surely, 2^20354204239 is an apocalyptic number.

20354204239 is a deficient number, since it is larger than the sum of its proper divisors (84457521).

20354204239 is an equidigital number, since it uses as much as digits as its factorization.

20354204239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84457520.

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 20354204239 in words is "twenty billion, three hundred fifty-four million, two hundred four thousand, two hundred thirty-nine".