20305242653 has 4 divisors (see below), whose sum is σ = 20307733440. Its totient is φ = 20302751868.

The previous prime is 20305242647. The next prime is 20305242673. The reversal of 20305242653 is 35624250302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20305242653 - 2⁶ = 20305242589 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 (20305242613) 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, 1233125 + ... + 1249482.

It is an arithmetic number, because the mean of its divisors is an integer number (5076933360).

Almost surely, 2^20305242653 is an apocalyptic number.

It is an amenable number.

20305242653 is a deficient number, since it is larger than the sum of its proper divisors (2490787).

20305242653 is an equidigital number, since it uses as much as digits as its factorization.

20305242653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490786.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 20305242653 its reverse (35624250302), we get a palindrome (55929492955).

The spelling of 20305242653 in words is "twenty billion, three hundred five million, two hundred forty-two thousand, six hundred fifty-three".