20363353457 has 4 divisors (see below), whose sum is σ = 21561197796. Its totient is φ = 19165509120.

The previous prime is 20363353441. The next prime is 20363353459. The reversal of 20363353457 is 75435336302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18030849841 + 2332503616 = 134279^2 + 48296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20363353457 - 2⁴ = 20363353441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20363353459) 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, 598922144 + ... + 598922177.

It is an arithmetic number, because the mean of its divisors is an integer number (5390299449).

Almost surely, 2^20363353457 is an apocalyptic number.

It is an amenable number.

20363353457 is a deficient number, since it is larger than the sum of its proper divisors (1197844339).

20363353457 is a wasteful number, since it uses less digits than its factorization.

20363353457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197844338.

The product of its (nonzero) digits is 680400, while the sum is 41.

Adding to 20363353457 its reverse (75435336302), we get a palindrome (95798689759).

The spelling of 20363353457 in words is "twenty billion, three hundred sixty-three million, three hundred fifty-three thousand, four hundred fifty-seven".