20504245343 has 4 divisors (see below), whose sum is σ = 21710377440. Its totient is φ = 19298113248.

The previous prime is 20504245337. The next prime is 20504245351. The reversal of 20504245343 is 34354240502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34354240502 = 2 ⋅17177120251.

It is a cyclic number.

It is not a de Polignac number, because 20504245343 - 2²⁶ = 20437136479 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 (20504245243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603066023 + ... + 603066056.

It is an arithmetic number, because the mean of its divisors is an integer number (5427594360).

Almost surely, 2^20504245343 is an apocalyptic number.

20504245343 is a deficient number, since it is larger than the sum of its proper divisors (1206132097).

20504245343 is a wasteful number, since it uses less digits than its factorization.

20504245343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206132096.

The product of its (nonzero) digits is 57600, while the sum is 32.

Adding to 20504245343 its reverse (34354240502), we get a palindrome (54858485845).

The spelling of 20504245343 in words is "twenty billion, five hundred four million, two hundred forty-five thousand, three hundred forty-three".