20635653061213 has 4 divisors (see below), whose sum is σ = 20635664090560. Its totient is φ = 20635642031868.

The previous prime is 20635653061171. The next prime is 20635653061223. The reversal of 20635653061213 is 31216035653602.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20635653061213 - 2¹³ = 20635653053021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20635653061213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20635653061223) 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, 1932645 + ... + 6708682.

It is an arithmetic number, because the mean of its divisors is an integer number (5158916022640).

Almost surely, 2^{20635653061213} is an apocalyptic number.

It is an amenable number.

20635653061213 is a deficient number, since it is larger than the sum of its proper divisors (11029347).

20635653061213 is an equidigital number, since it uses as much as digits as its factorization.

20635653061213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11029346.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 20635653061213 in words is "twenty trillion, six hundred thirty-five billion, six hundred fifty-three million, sixty-one thousand, two hundred thirteen".