20613501361 has 4 divisors (see below), whose sum is σ = 20962882800. Its totient is φ = 20264119924.

The previous prime is 20613501353. The next prime is 20613501401. The reversal of 20613501361 is 16310531602.

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 20613501361 - 2³ = 20613501353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20613501661) 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, 174690631 + ... + 174690748.

It is an arithmetic number, because the mean of its divisors is an integer number (5240720700).

Almost surely, 2^20613501361 is an apocalyptic number.

It is an amenable number.

20613501361 is a deficient number, since it is larger than the sum of its proper divisors (349381439).

20613501361 is an equidigital number, since it uses as much as digits as its factorization.

20613501361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349381438.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 20613501361 in words is "twenty billion, six hundred thirteen million, five hundred one thousand, three hundred sixty-one".