20536243653 has 4 divisors (see below), whose sum is σ = 27381658208. Its totient is φ = 13690829100.

The previous prime is 20536243639. The next prime is 20536243667. The reversal of 20536243653 is 35634263502.

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 an interprime number because it is at equal distance from previous prime (20536243639) and next prime (20536243667).

It is not a de Polignac number, because 20536243653 - 2⁵ = 20536243621 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 (20536243153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3422707273 + ... + 3422707278.

It is an arithmetic number, because the mean of its divisors is an integer number (6845414552).

Almost surely, 2^20536243653 is an apocalyptic number.

It is an amenable number.

20536243653 is a deficient number, since it is larger than the sum of its proper divisors (6845414555).

20536243653 is an equidigital number, since it uses as much as digits as its factorization.

20536243653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6845414554.

The product of its (nonzero) digits is 388800, while the sum is 39.

The spelling of 20536243653 in words is "twenty billion, five hundred thirty-six million, two hundred forty-three thousand, six hundred fifty-three".