20512403653 has 4 divisors (see below), whose sum is σ = 23442747040. Its totient is φ = 17582060268.

The previous prime is 20512403633. The next prime is 20512403701. The reversal of 20512403653 is 35630421502.

It is a happy number.

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 20512403653 - 2⁹ = 20512403141 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 (20512403633) 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, 1465171683 + ... + 1465171696.

It is an arithmetic number, because the mean of its divisors is an integer number (5860686760).

Almost surely, 2^20512403653 is an apocalyptic number.

It is an amenable number.

20512403653 is a deficient number, since it is larger than the sum of its proper divisors (2930343387).

20512403653 is an equidigital number, since it uses as much as digits as its factorization.

20512403653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930343386.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 20512403653 in words is "twenty billion, five hundred twelve million, four hundred three thousand, six hundred fifty-three".