20353430453 has 4 divisors (see below), whose sum is σ = 20849855628. Its totient is φ = 19857005280.

The previous prime is 20353430437. The next prime is 20353430473. The reversal of 20353430453 is 35403435302.

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 1682394289 + 18671036164 = 41017^2 + 136642^2 .

It is a cyclic number.

It is not a de Polignac number, because 20353430453 - 2⁴ = 20353430437 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 (20353430473) 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, 248212526 + ... + 248212607.

It is an arithmetic number, because the mean of its divisors is an integer number (5212463907).

Almost surely, 2^20353430453 is an apocalyptic number.

It is an amenable number.

20353430453 is a deficient number, since it is larger than the sum of its proper divisors (496425175).

20353430453 is an equidigital number, since it uses as much as digits as its factorization.

20353430453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496425174.

The product of its (nonzero) digits is 64800, while the sum is 32.

Adding to 20353430453 its reverse (35403435302), we get a palindrome (55756865755).

The spelling of 20353430453 in words is "twenty billion, three hundred fifty-three million, four hundred thirty thousand, four hundred fifty-three".